feat: casino framework and basic slot machine

29 files changed, 1931 insertions, 66 deletions

diff --git a/building_guide/rooms.md b/building_guide/rooms.md
index 602e449..7641c75 100644
--- a/building_guide/rooms.md
+++ b/building_guide/rooms.md
@@ -218,6 +218,39 @@ Mobs stop wandering while in combat. Dead mobs respawn at their home room.
 
 ---
 
+### Casino Tables
+
+Rooms may host one or more casino tables. Players join by typing `play <game>`;
+the table ID is an internal room-local identifier and does not need to be typed.
+
+```yaml
+casino_tables:
+  - id: slots
+    game: slots
+    max_players: 8
+    betting_ticks: 20
+    min_bet: 1
+    max_bet: 1000
+```
+
+`max_players`, `betting_ticks`, `min_bet`, and `max_bet` use defaults when omitted.
+Game-specific rule configuration will be added alongside the table definition as
+each game is implemented.
+
+Single-player machines use `casino_machines` and are separate from multiplayer
+tables:
+
+```yaml
+casino_machines:
+  - id: huff_puff_01
+    game: slots
+    variant: huff_and_even_more_puff
+    min_bet: 1
+    max_bet: 1000
+    spin_ticks: 1
+    payout: 0.97
+```
+
 ### Objects — interactive fixtures
 
 Simple placement:
diff --git a/building_guide/tick_order.md b/building_guide/tick_order.md
index 6138fbe..b4d1f1e 100644
--- a/building_guide/tick_order.md
+++ b/building_guide/tick_order.md
@@ -34,27 +34,28 @@ duplicates so any one of them drifting fails the test loudly.
 | #   | System                  | What it does                                                                                                        |
 | --- | ----------------------- | ------------------------------------------------------------------------------------------------------------------ |
 | 1   | `ProcessQueuedCommands` | Drains each player's free-queued commands and the globally timestamp-sorted active queue; advances walk sequences. |
-| 2   | `MoveTick`              | Counts down `p.MoveTicks`; on reach-zero, completes a pending run/walk and re-prompts.                             |
-| 3   | `SequenceTick`          | Advances every active trigger `sequence` (per-player and global) one step.                                         |
-| 4   | `TransientMobTick`      | Despawns owned / `DespawnOnLeave` mobs whose owner has left their room.                                            |
-| 5   | `World.Tick`            | World-internal: ground-item respawn/despawn/reserve timers and shared-object deplete timers.                        |
-| 6   | `MobStore.Tick`         | Mob shop restock and mob HP regenerate. Order: by `InstanceID` so processing is stable across ticks.              |
-| 7   | `RegenTick`             | Player HP regeneration, accelerated by tech HP-regen multipliers.                                                  |
-| 8   | `EnergyRegenTick`       | Run-energy regeneration for every online player.                                                                   |
-| 9   | `DisconnectTick`        | Counts down pending disconnects and hard-removes finished sessions (skipping players still in combat).             |
-| 10  | `WanderTick`            | Mob wandering (exit-based) and object wandering (fishing spots), with enter/leave messages to observers.           |
-| 11  | `SharedDepletionTick`   | Ticks shared-object deplete timers up (in use) or down (recovering).                                               |
-| 12  | `FireTick`              | Decays fire objects; on burn-out, spawns the removal item and cancels stokers.                                     |
-| 13  | `AdvanceActions`        | Advances every active player action by one tick; fires completion handlers per action type.                        |
-| 14  | `TechTick`              | Drains battery for active tech, applies equipment / PreserveDrain reductions, and deactivates all on empty.        |
-| 15  | `ConsumeTick`           | Counts down `ConsumeCooldown` and `HomeTransportCooldown`.                                                         |
-| 16  | `BroadcastRespawns`     | Flushes respawned world objects and broadcasts their `respawn_broadcast` lines to players in those rooms.           |
-| 17  | `VisualTick`            | Optional per-player "visual tick" line/counter for AFK feedback.                                                   |
-| 18  | `SneakTick`             | Advances guard watch timers and sneaking players' tick counters.                                                   |
-| 19  | `FarmTick`              | Crops grow, drain water, and yield on harvest (fires every `FarmTickInterval` ticks).                              |
-| 20  | `BuffTick`              | Potion buff duration countdown; expires and removes effects.                                                      |
-| 21  | `SafespotTick`          | Safespot unsafe-chance and decay-chance rolls per player.                                                          |
-| 22  | `HazardTick`            | Room hazard damage to non-GodMode players.                                                                         |
+| 2   | `CasinoTick`            | Advances casino betting deadlines and resolves completed casino rounds.                                            |
+| 3   | `MoveTick`              | Counts down `p.MoveTicks`; on reach-zero, completes a pending run/walk and re-prompts.                             |
+| 4   | `SequenceTick`          | Advances every active trigger `sequence` (per-player and global) one step.                                         |
+| 5   | `TransientMobTick`      | Despawns owned / `DespawnOnLeave` mobs whose owner has left their room.                                            |
+| 6   | `World.Tick`            | World-internal: ground-item respawn/despawn/reserve timers and shared-object deplete timers.                        |
+| 7   | `MobStore.Tick`         | Mob shop restock and mob HP regenerate. Order: by `InstanceID` so processing is stable across ticks.              |
+| 8   | `RegenTick`             | Player HP regeneration, accelerated by tech HP-regen multipliers.                                                  |
+| 9   | `EnergyRegenTick`       | Run-energy regeneration for every online player.                                                                   |
+| 10  | `DisconnectTick`        | Counts down pending disconnects and hard-removes finished sessions (skipping players still in combat).             |
+| 11  | `WanderTick`            | Mob wandering (exit-based) and object wandering (fishing spots), with enter/leave messages to observers.           |
+| 12  | `SharedDepletionTick`   | Ticks shared-object deplete timers up (in use) or down (recovering).                                               |
+| 13  | `FireTick`              | Decays fire objects; on burn-out, spawns the removal item and cancels stokers.                                     |
+| 14  | `AdvanceActions`        | Advances every active player action by one tick; fires completion handlers per action type.                        |
+| 15  | `TechTick`              | Drains battery for active tech, applies equipment / PreserveDrain reductions, and deactivates all on empty.        |
+| 16  | `ConsumeTick`           | Counts down `ConsumeCooldown` and `HomeTransportCooldown`.                                                         |
+| 17  | `BroadcastRespawns`     | Flushes respawned world objects and broadcasts their `respawn_broadcast` lines to players in those rooms.           |
+| 18  | `VisualTick`            | Optional per-player "visual tick" line/counter for AFK feedback.                                                   |
+| 19  | `SneakTick`             | Advances guard watch timers and sneaking players' tick counters.                                                   |
+| 20  | `FarmTick`              | Crops grow, drain water, and yield on harvest (fires every `FarmTickInterval` ticks).                              |
+| 21  | `BuffTick`              | Potion buff duration countdown; expires and removes effects.                                                      |
+| 22  | `SafespotTick`          | Safespot unsafe-chance and decay-chance rolls per player.                                                          |
+| 23  | `HazardTick`            | Room hazard damage to non-GodMode players.                                                                         |
 
 ### Determinism contract
 
@@ -65,7 +66,7 @@ Three layers of ordering decide what happens on a given tick, in priority:
    `cmd/thoi/main.go`) always fires first; every system in
    `RunTickSystems` then runs in the table order above. Dynamic combat /
    aggro / respawn subscribers registered later get higher IDs and fire
-   after the canonical 22 systems. This is asserted by
+    after the canonical 23 systems. This is asserted by
    `internal/engine/tick_test.go::TestProcessTickFiresInSubscriptionOrder`.
 
 2. **Per-system iteration order** — deterministic, as of the deterministic
@@ -138,4 +139,4 @@ should fire *after* regen, a sequence whose step messages should appear
   already advanced.
 
 When in doubt, the test in `tick_systems_test.go` is the executable
-specification.
\ No newline at end of file
+specification.
diff --git a/building_guide/triggers.md b/building_guide/triggers.md
index 60b1c82..f7720bb 100644
--- a/building_guide/triggers.md
+++ b/building_guide/triggers.md
@@ -47,7 +47,8 @@ its steps run as a scripted sequence.
         take_item: ""
         teleport: 0
         heal: 0
-        credits: 0
+         credits: 0
+         start_game: ""         # joins a casino table for the current room
         spawn_mob: null           # SpawnMobConfig (or bare string)
         despawn_mob: ""
         aps_node: false
@@ -87,6 +88,7 @@ wait elapses.
 | `teleport` | Moves the player to a room ID. |
 | `heal` | Restores hitpoints (clamped to MaxHP). |
 | `credits` | Positive = award, negative = deduct credits. |
+| `start_game` | Joins the named casino game configured in the player's current room. |
 | `aps_node` | Marks this room's APS node as unlocked. |
 | `condition` | Per-step gate (evaluated once when the sequence reaches this step). |
 
@@ -726,4 +728,4 @@ definition, `give_item`/`take_item` reference existing items, `teleport` and
 
 Validation does NOT check that the watched flags (`on_player_flag` / `on_global_flag`)
 are ever set — those are dynamic, set by runtime gameplay, and can't be statically
-verified.
\ No newline at end of file
+verified.
diff --git a/config.yaml b/config.yaml
index 120043d..3d10c6e 100644
--- a/config.yaml
+++ b/config.yaml
@@ -62,6 +62,14 @@ default_colors:
   say:               "FF"
   global:            "49"
   broadcast:         "89"
+  casino_action:     "6E"
+  casino_menu:       "FA"
+  casino_win:        "g:FA,FB,FD"
+  casino_payout:     "bold FA"
+  casino_big_win:    "g:220,226 bold"
+  casino_jackpot_win: "g:220,226,46,51,129,201 bold"
+  casino_chips:      "g:220,226"
+  casino_credits:    "g:39,45"
   dialog:            "6E"
   dialog_options:    "bold"
   drop_message:      "89"
diff --git a/data/.admin_history.json b/data/.admin_history.json
new file mode 100644
index 0000000..e856da6
--- /dev/null
+++ b/data/.admin_history.json
@@ -0,0 +1 @@
+{"history":[{"time":"2026-07-31T13:48:03-04:00","description":"update room 2001","file_path":"data/rooms/intro/2001.yaml","old_content":"id: 2001\nname: Test Room\ncolor: \"\"\ndescription:\n  - text: It's a test room\nexits:\n  east:\n    room: 1005\n  south:\n    room: 2006\n  west:\n    room: 1001\nobjects:\n  - name: hidden guy\n    hidden: true\n    description:\n      - text: YOU FOUND HIM\n  - id: tree\nitem_spawns:\n  - id: bronze_axe\n    quantity: 1\n    respawn_ticks: 1\n  - id: pot_of_flour\n    quantity: 1\n    respawn_ticks: 1\n  - id: bucket_of_water\n    quantity: 1\n    respawn_ticks: 1\nmobs:\n  - id: man\non_enter: []\nhazard: \"\"\nblock_transport: false\ntriggers: []\ncasino_tables:\n - id: slots\n   game: slots\n   max_players: 8\n   betting_ticks: 20\n   min_bet: 1\n   max_bet: 1000\n\n","new_content":"block_transport: false\ncasino_tables:\n  - betting_ticks: 20\n    game: slots\n    id: slots\n    max_bet: 1000\n    max_players: 8\n    min_bet: 1\ncolor: \"\"\ndescription:\n  - text: It's a test room\nexits:\n  east:\n    room: 1005\n  south:\n    room: 2006\n  west:\n    room: 1001\nhazard: \"\"\nid: 2001\nitem_spawns:\n  - id: bronze_axe\n    quantity: 1\n    respawn_ticks: 1\n  - id: pot_of_flour\n    quantity: 1\n    respawn_ticks: 1\n  - id: bucket_of_water\n    quantity: 1\n    respawn_ticks: 1\n  - id: chips\n    quantity: 1\n    respawn_ticks: 0\nmobs:\n  - id: man\nname: Test Room\nobjects:\n  - description:\n      - text: YOU FOUND HIM\n    hidden: true\n    name: hidden guy\n  - id: tree\non_enter: []\ntriggers: []\n","is_delete":false,"is_create":false},{"time":"2026-07-31T13:48:06-04:00","description":"update room 2001","file_path":"data/rooms/intro/2001.yaml","old_content":"block_transport: false\ncasino_tables:\n  - betting_ticks: 20\n    game: slots\n    id: slots\n    max_bet: 1000\n    max_players: 8\n    min_bet: 1\ncolor: \"\"\ndescription:\n  - text: It's a test room\nexits:\n  east:\n    room: 1005\n  south:\n    room: 2006\n  west:\n    room: 1001\nhazard: \"\"\nid: 2001\nitem_spawns:\n  - id: bronze_axe\n    quantity: 1\n    respawn_ticks: 1\n  - id: pot_of_flour\n    quantity: 1\n    respawn_ticks: 1\n  - id: bucket_of_water\n    quantity: 1\n    respawn_ticks: 1\n  - id: chips\n    quantity: 1\n    respawn_ticks: 0\nmobs:\n  - id: man\nname: Test Room\nobjects:\n  - description:\n      - text: YOU FOUND HIM\n    hidden: true\n    name: hidden guy\n  - id: tree\non_enter: []\ntriggers: []\n","new_content":"block_transport: false\ncasino_tables:\n  - betting_ticks: 20\n    game: slots\n    id: slots\n    max_bet: 1000\n    max_players: 8\n    min_bet: 1\ncolor: \"\"\ndescription:\n  - text: It's a test room\nexits:\n  east:\n    room: 1005\n  south:\n    room: 2006\n  west:\n    room: 1001\nhazard: \"\"\nid: 2001\nitem_spawns:\n  - id: bronze_axe\n    quantity: 1\n    respawn_ticks: 1\n  - id: pot_of_flour\n    quantity: 1\n    respawn_ticks: 1\n  - id: bucket_of_water\n    quantity: 1\n    respawn_ticks: 1\n  - id: chips\n    quantity: 5000\n    respawn_ticks: 0\nmobs:\n  - id: man\nname: Test Room\nobjects:\n  - description:\n      - text: YOU FOUND HIM\n    hidden: true\n    name: hidden guy\n  - id: tree\non_enter: []\ntriggers: []\n","is_delete":false,"is_create":false},{"time":"2026-07-31T13:48:07-04:00","description":"update room 2001","file_path":"data/rooms/intro/2001.yaml","old_content":"block_transport: false\ncasino_tables:\n  - betting_ticks: 20\n    game: slots\n    id: slots\n    max_bet: 1000\n    max_players: 8\n    min_bet: 1\ncolor: \"\"\ndescription:\n  - text: It's a test room\nexits:\n  east:\n    room: 1005\n  south:\n    room: 2006\n  west:\n    room: 1001\nhazard: \"\"\nid: 2001\nitem_spawns:\n  - id: bronze_axe\n    quantity: 1\n    respawn_ticks: 1\n  - id: pot_of_flour\n    quantity: 1\n    respawn_ticks: 1\n  - id: bucket_of_water\n    quantity: 1\n    respawn_ticks: 1\n  - id: chips\n    quantity: 5000\n    respawn_ticks: 0\nmobs:\n  - id: man\nname: Test Room\nobjects:\n  - description:\n      - text: YOU FOUND HIM\n    hidden: true\n    name: hidden guy\n  - id: tree\non_enter: []\ntriggers: []\n","new_content":"block_transport: false\ncasino_tables:\n  - betting_ticks: 20\n    game: slots\n    id: slots\n    max_bet: 1000\n    max_players: 8\n    min_bet: 1\ncolor: \"\"\ndescription:\n  - text: It's a test room\nexits:\n  east:\n    room: 1005\n  south:\n    room: 2006\n  west:\n    room: 1001\nhazard: \"\"\nid: 2001\nitem_spawns:\n  - id: bronze_axe\n    quantity: 1\n    respawn_ticks: 1\n  - id: pot_of_flour\n    quantity: 1\n    respawn_ticks: 1\n  - id: bucket_of_water\n    quantity: 1\n    respawn_ticks: 1\n  - id: chips\n    quantity: 5000\n    respawn_ticks: 1\nmobs:\n  - id: man\nname: Test Room\nobjects:\n  - description:\n      - text: YOU FOUND HIM\n    hidden: true\n    name: hidden guy\n  - id: tree\non_enter: []\ntriggers: []\n","is_delete":false,"is_create":false}],"redo":null}
\ No newline at end of file
diff --git a/data/rooms/intro/2001.yaml b/data/rooms/intro/2001.yaml
index 8f1db38..ed10efa 100644
--- a/data/rooms/intro/2001.yaml
+++ b/data/rooms/intro/2001.yaml
@@ -1,5 +1,11 @@
-id: 2001
-name: Test Room
+block_transport: false
+casino_machines:
+ - id: huff_puff_01
+   game: slots
+   variant: huff_and_even_more_puff
+   min_bet: 1
+   max_bet: 1000
+   payout: 0.97
 color: ""
 description:
   - text: It's a test room
@@ -10,12 +16,8 @@ exits:
     room: 2006
   west:
     room: 1001
-objects:
-  - name: hidden guy
-    hidden: true
-    description:
-      - text: YOU FOUND HIM
-  - id: tree
+hazard: ""
+id: 2001
 item_spawns:
   - id: bronze_axe
     quantity: 1
@@ -26,9 +28,17 @@ item_spawns:
   - id: bucket_of_water
     quantity: 1
     respawn_ticks: 1
+  - id: chips
+    quantity: 5000
+    respawn_ticks: 1
 mobs:
   - id: man
+name: Test Room
+objects:
+  - description:
+      - text: YOU FOUND HIM
+    hidden: true
+    name: hidden guy
+  - id: tree
 on_enter: []
-hazard: ""
-block_transport: false
 triggers: []
diff --git a/internal/behavior/behavior.go b/internal/behavior/behavior.go
index 7dab514..116918e 100644
--- a/internal/behavior/behavior.go
+++ b/internal/behavior/behavior.go
@@ -69,6 +69,7 @@ type Step struct {
 	Teleport        int             `yaml:"teleport,omitempty" json:"teleport,omitempty"`
 	Heal            int             `yaml:"heal,omitempty" json:"heal,omitempty"`
 	Credits         int             `yaml:"credits,omitempty" json:"credits,omitempty"`
+	StartGame       string          `yaml:"start_game,omitempty" json:"start_game,omitempty"`
 	ApsNode         bool            `yaml:"aps_node,omitempty" json:"aps_node,omitempty"`
 	DropTable       []DropEntry     `yaml:"drop_table,omitempty" json:"drop_table,omitempty"`
 }
@@ -79,7 +80,7 @@ func (s Step) HasEffects() bool {
 		s.SpawnMob != nil || s.DespawnMob != "" ||
 		len(s.SetGlobalFlags) > 0 || len(s.SetPlayerFlags) > 0 ||
 		s.GiveItem != "" || s.TakeItem != "" || s.Teleport != 0 || s.Heal != 0 ||
-		s.Credits != 0 || s.ApsNode || len(s.DropTable) > 0
+		s.Credits != 0 || s.StartGame != "" || s.ApsNode || len(s.DropTable) > 0
 }
 
 // Trigger is the one conditional wrapper used by every event block in the
diff --git a/internal/casino/machine.go b/internal/casino/machine.go
new file mode 100644
index 0000000..d9fa590
--- /dev/null
+++ b/internal/casino/machine.go
@@ -0,0 +1,364 @@
+package casino
+
+import (
+	"fmt"
+	"math/rand"
+	"sync"
+)
+
+type machinePhase string
+
+const (
+	machineReady    machinePhase = "ready"
+	machineSpinning machinePhase = "spinning"
+	machinePayout   machinePhase = "payout"
+	payoutDelay                  = 2
+)
+
+type Machine struct {
+	mu              sync.Mutex
+	RoomID          int
+	Config          MachineConfig
+	player          *Participant
+	bet             int
+	phase           machinePhase
+	spin            *SlotSpin
+	reel            int
+	clock           int
+	freeSpins       int
+	spinBet         int
+	payoutRemainder float64
+	profile         SlotProfile
+	rng             *rand.Rand
+	suspense        bool
+	autoBet         bool
+	autoCountdown   int
+}
+
+func newMachine(roomID int, cfg MachineConfig, rng *rand.Rand) *Machine {
+	profile := DefaultHuffAndPuffProfile()
+	if cfg.Payout > 0 {
+		profile = ScaleToRTP(profile, cfg.Payout)
+	}
+	return &Machine{RoomID: roomID, Config: cfg, phase: machineReady, profile: profile, rng: rng}
+}
+
+func (m *Machine) join(name string) []Event {
+	m.mu.Lock()
+	defer m.mu.Unlock()
+	if m.player != nil && m.player.Name != name {
+		return []Event{{RoomID: m.RoomID, TableID: m.Config.ID, Type: EventResult, PrivateTo: name, Message: "That slot machine is occupied."}}
+	}
+	if m.player == nil {
+		m.player = &Participant{Name: name, Connected: true}
+		events := []Event{{RoomID: m.RoomID, TableID: m.Config.ID, Type: EventJoined, Player: name,
+			Message:        fmt.Sprintf("%s sits down at the slots machine.", name),
+			PrivateMessage: "You sit down at the slot machine.", PrivateTo: name, Color: "casino_action", Public: true}}
+		return append(events, m.privateMenu("You sit down at the slot machine.")...)
+	}
+	m.player.Connected = true
+	if m.autoBet {
+		return m.private("Autobet is active. Type \"stop\" to stop playing.")
+	}
+	return m.menuEvents("You resume your place at the slot machine.")
+}
+
+func (m *Machine) setBet(name string, amount int) []Event {
+	m.mu.Lock()
+	defer m.mu.Unlock()
+	if !m.owns(name) {
+		return m.private("You aren't playing at a slot machine.")
+	}
+	if m.autoBet {
+		return m.private("Autobet is active. Type \"stop\" to stop playing.")
+	}
+	if m.phase != machineReady {
+		return m.private("You're in the middle of a spin!")
+	}
+	if amount < m.Config.MinBet || amount > m.Config.MaxBet {
+		return m.private(fmt.Sprintf("Slot machine bets must be between %d and %d.", m.Config.MinBet, m.Config.MaxBet))
+	}
+	m.bet = amount
+	return m.menuEvents(fmt.Sprintf("Your slot machine bet is set to %d.", amount))
+}
+
+func (m *Machine) start(name string, wallet Wallet) []Event {
+	m.mu.Lock()
+	defer m.mu.Unlock()
+	if !m.owns(name) {
+		return m.private("You aren't playing at a slot machine.")
+	}
+	if m.autoBet {
+		return m.private("Autobet is active. Type \"stop\" to stop playing.")
+	}
+	if m.phase != machineReady {
+		return m.private("You're in the middle of a spin!")
+	}
+	if m.bet <= 0 {
+		return m.private("Set a wager first with 'bet <amount>'.")
+	}
+	wager := m.bet
+	if m.freeSpins > 0 {
+		m.spinBet = wager
+	} else {
+		if _, ok := wallet.Wager(wager); !ok {
+			return m.private("You don't have enough chips and credits for that bet.")
+		}
+		m.spinBet = wager
+	}
+	m.player.Wallet = wallet
+	m.spin = generateSlotSpinWithProfile(m.rng, m.spinBet, m.profile)
+	m.reel, m.clock, m.suspense = 0, 0, false
+	m.phase = machineSpinning
+	if m.freeSpins > 0 {
+		m.freeSpins--
+		return m.playerAction(fmt.Sprintf("%s begins a free spin.", name), "You begin a free spin.")
+	}
+	return m.playerAction(fmt.Sprintf("%s pulls the lever on the slots machine.", name), "You pull the lever on the slots machine.")
+}
+
+func (m *Machine) enableAutoBet(name string, wallet Wallet) []Event {
+	m.mu.Lock()
+	defer m.mu.Unlock()
+	if !m.owns(name) {
+		return m.private("You aren't playing at a slot machine.")
+	}
+	if m.autoBet {
+		return m.private("Autobet is already active.")
+	}
+	if m.phase != machineReady {
+		return m.private("You're in the middle of a spin!")
+	}
+	if m.bet <= 0 {
+		return m.private("Set a wager first with 'bet <amount>'.")
+	}
+	m.player.Wallet = wallet
+	m.autoBet = true
+	m.autoCountdown = 0
+	return nil
+}
+
+func (m *Machine) stopAutoBet(name string) ([]Event, bool) {
+	m.mu.Lock()
+	defer m.mu.Unlock()
+	if !m.owns(name) || !m.autoBet {
+		return nil, false
+	}
+	m.autoBet = false
+	m.autoCountdown = 0
+	return m.private("Autobet stopped. You remain at the slot machine."), true
+}
+
+func (m *Machine) tick() []Event {
+	m.mu.Lock()
+	defer m.mu.Unlock()
+	if m.phase == machineReady && m.autoBet {
+		return m.autoBetTick()
+	}
+	if (m.phase != machineSpinning && m.phase != machinePayout) || m.spin == nil {
+		return nil
+	}
+	if m.phase == machinePayout {
+		m.clock++
+		if m.clock < payoutDelay {
+			return nil
+		}
+		m.clock = 0
+		m.phase = machineReady
+		return m.finishSpin()
+	}
+	m.clock++
+	delay := m.Config.SpinTicks
+	if m.suspense && delay < 4 {
+		delay = 4
+	}
+	if m.clock < delay {
+		return nil
+	}
+	m.clock = 0
+	m.reel++
+	message := fmt.Sprintf("Reel %d stops...", m.reel)
+	events := m.publicSlot(message, m.reel)
+	if m.reel < 5 && stoppedScatters(m.spin.Grid, m.reel) >= 2 && !m.suspense {
+		m.suspense = true
+		events = append(events, m.public("Two scatters! The remaining reels slow down...")...)
+	}
+	if m.reel < 5 {
+		return events
+	}
+	m.phase = machinePayout
+	m.clock = 0
+	return events
+}
+
+func (m *Machine) autoBetTick() []Event {
+	m.autoCountdown++
+	switch m.autoCountdown {
+	case 1:
+		return m.private("Autobet enabled!")
+	case 2:
+		return m.private(`Type "stop" to stop playing`)
+	case 3:
+		m.autoCountdown = 0
+		if m.bet <= 0 || m.player.Wallet == nil {
+			m.autoBet = false
+			return m.private("Autobet stopped: no wager is set.")
+		}
+		if _, ok := m.player.Wallet.Wager(m.bet); !ok {
+			m.autoBet = false
+			return m.private("Autobet stopped: you don't have enough chips and credits for that bet.")
+		}
+		m.spinBet = m.bet
+		m.spin = generateSlotSpinWithProfile(m.rng, m.spinBet, m.profile)
+		m.reel, m.clock, m.suspense = 0, 0, false
+		m.phase = machineSpinning
+		return m.playerAction(fmt.Sprintf("%s starts an automatic spin.", m.player.Name), fmt.Sprintf("Betting... %d credits.", m.bet))
+	default:
+		return nil
+	}
+}
+
+func (m *Machine) finishSpin() []Event {
+	events := []Event{}
+	result := m.spin.Payout + m.payoutRemainder
+	credits := int(result)
+	m.payoutRemainder = result - float64(credits)
+	if credits > 0 && m.player.Wallet != nil {
+		m.player.Wallet.PayCredits(credits)
+	}
+	if credits > 0 {
+		winEvents := m.private(fmt.Sprintf("\nYou win %d credits.", credits))
+		winEvents[0].Color = "casino_payout"
+		if credits > m.spinBet {
+			winEvents[0].Color = "casino_big_win"
+		}
+		if credits >= 2*m.spinBet {
+			winEvents[0].Color = "casino_jackpot_win"
+		}
+		events = append(events, winEvents...)
+	}
+	if len(m.spin.Wins) > 0 {
+		winEvents := m.private(formatWins(m.spin.Wins))
+		winEvents[0].Color = "casino_win"
+		events = append(events, winEvents...)
+	}
+	if m.spin.ScatterCount >= 3 && m.freeSpins == 0 {
+		m.freeSpins = 8
+		events = append(events, m.public("Three scatter symbols trigger 8 free spins!")...)
+	}
+	if m.freeSpins > 0 {
+		m.freeSpins--
+		m.phase = machineSpinning
+		m.spin = generateSlotSpinWithProfile(m.rng, m.spinBet, m.profile)
+		m.reel, m.clock, m.suspense = 0, 0, false
+		events = append(events, m.public(fmt.Sprintf("%d free spins remain.", m.freeSpins))...)
+	} else if !m.autoBet {
+		events = append(events, m.menuEvents("")...)
+	}
+	return events
+}
+
+func (m *Machine) leave(name string) []Event {
+	m.mu.Lock()
+	defer m.mu.Unlock()
+	if !m.owns(name) {
+		return nil
+	}
+	if m.phase != machineReady {
+		return m.private("You're in the middle of a spin!")
+	}
+	m.player = nil
+	m.bet = 0
+	return []Event{{RoomID: m.RoomID, TableID: m.Config.ID, Type: EventLeft, Player: name,
+		Message: fmt.Sprintf("%s stands up from the slots machine.", name), PrivateMessage: "You stand up from the slot machine.", PrivateTo: name, Color: "casino_action", Public: true}}
+}
+
+func (m *Machine) markDisconnected(name string) []Event {
+	m.mu.Lock()
+	defer m.mu.Unlock()
+	if m.owns(name) {
+		m.player.Connected = false
+	}
+	return nil
+}
+
+func (m *Machine) markConnected(name string) {
+	m.mu.Lock()
+	defer m.mu.Unlock()
+	if m.owns(name) {
+		m.player.Connected = true
+	}
+}
+
+func (m *Machine) hasParticipant(name string) bool {
+	m.mu.Lock()
+	defer m.mu.Unlock()
+	return m.owns(name)
+}
+
+func (m *Machine) isBusy(name string) bool {
+	m.mu.Lock()
+	defer m.mu.Unlock()
+	return m.owns(name) && (m.autoBet || m.phase == machineSpinning || m.phase == machinePayout)
+}
+
+func (m *Machine) owns(name string) bool { return m.player != nil && m.player.Name == name }
+
+func (m *Machine) private(message string) []Event {
+	return []Event{{RoomID: m.RoomID, TableID: m.Config.ID, Type: EventResult, PrivateTo: m.player.Name, Message: message, Color: "casino_action"}}
+}
+
+func (m *Machine) public(message string) []Event {
+	return []Event{{RoomID: m.RoomID, TableID: m.Config.ID, Type: EventResult, Player: m.player.Name, Message: message, Color: "casino_action", Public: true}}
+}
+
+func (m *Machine) playerAction(publicMessage, privateMessage string) []Event {
+	return []Event{{RoomID: m.RoomID, TableID: m.Config.ID, Type: EventResult, Player: m.player.Name,
+		Message: publicMessage, PrivateMessage: privateMessage, PrivateTo: m.player.Name, Color: "casino_action", Public: true}}
+}
+
+func (m *Machine) publicSlot(message string, stopped int) []Event {
+	return []Event{{RoomID: m.RoomID, TableID: m.Config.ID, Type: EventResult, Player: m.player.Name,
+		Message: message, Color: "casino_action", Public: true, Slot: &SlotSnapshot{Grid: m.spin.Grid, StoppedReels: stopped}}}
+}
+
+func stoppedScatters(grid [3][5]string, reels int) int {
+	count := 0
+	for row := 0; row < 3; row++ {
+		for reel := 0; reel < reels && reel < 5; reel++ {
+			if grid[row][reel] == "scatter" {
+				count++
+			}
+		}
+	}
+	return count
+}
+
+func formatWins(wins []SlotWin) string {
+	message := "Winning lines/ways (243-way evaluation):\n"
+	for _, win := range wins {
+		message += fmt.Sprintf("  %s x%d: %d ways x %.4gx bet / 243 = %.4f credits\n", win.Symbol, win.Length, win.Ways, win.Multiplier, win.Payout)
+	}
+	return message[:len(message)-1]
+}
+
+func (m *Machine) privateMenu(prefix string) []Event {
+	if m.phase != machineReady {
+		events := m.private(prefix)
+		events[0].Color = "casino_menu"
+		return events
+	}
+	menu := "Slot machine commands:\n  bet <amount>  Set your wager\n  bet max       Set the maximum wager\n  spin          Spin using your current wager\n  autospin      Start automatic betting\n  stop          Leave the slot machine"
+	if prefix == "" {
+		prefix = "\n" + menu
+	} else {
+		prefix += "\n\n" + menu
+	}
+	events := m.private(prefix)
+	events[0].Color = "casino_menu"
+	return events
+}
+
+func (m *Machine) menuEvents(prefix string) []Event {
+	return m.privateMenu(prefix)
+}
diff --git a/internal/casino/manager.go b/internal/casino/manager.go
new file mode 100644
index 0000000..d6a3825
--- /dev/null
+++ b/internal/casino/manager.go
@@ -0,0 +1,238 @@
+package casino
+
+import (
+	"fmt"
+	"math/rand"
+	"sort"
+	"sync"
+)
+
+type Manager struct {
+	mu       sync.Mutex
+	tables   map[string]*Table
+	machines map[string]*Machine
+	rng      *rand.Rand
+}
+
+func NewManager(seed int64) *Manager {
+	return &Manager{
+		tables:   make(map[string]*Table),
+		machines: make(map[string]*Machine),
+		rng:      rand.New(rand.NewSource(seed)),
+	}
+}
+
+func (m *Manager) EnsureMachine(roomID int, cfg MachineConfig) *Machine {
+	cfg = cfg.Normalize()
+	key := tableKey(roomID, cfg.ID)
+	m.mu.Lock()
+	defer m.mu.Unlock()
+	if machine := m.machines[key]; machine != nil {
+		return machine
+	}
+	machine := newMachine(roomID, cfg, m.rng)
+	m.machines[key] = machine
+	return machine
+}
+
+func tableKey(roomID int, tableID string) string {
+	return fmt.Sprintf("%d:%s", roomID, tableID)
+}
+
+func (m *Manager) EnsureTable(roomID int, cfg TableConfig) *Table {
+	cfg = cfg.Normalize()
+	key := tableKey(roomID, cfg.ID)
+	m.mu.Lock()
+	defer m.mu.Unlock()
+	if table := m.tables[key]; table != nil {
+		return table
+	}
+	table := newTable(roomID, cfg, m.rng)
+	m.tables[key] = table
+	return table
+}
+
+func (m *Manager) Table(roomID int, tableID string) *Table {
+	m.mu.Lock()
+	defer m.mu.Unlock()
+	return m.tables[tableKey(roomID, tableID)]
+}
+
+func (m *Manager) Tick() []Event {
+	m.mu.Lock()
+	tables := make([]*Table, 0, len(m.tables))
+	for _, table := range m.tables {
+		tables = append(tables, table)
+	}
+	m.mu.Unlock()
+	sort.Slice(tables, func(i, j int) bool {
+		if tables[i].RoomID != tables[j].RoomID {
+			return tables[i].RoomID < tables[j].RoomID
+		}
+		return tables[i].Config.ID < tables[j].Config.ID
+	})
+	var events []Event
+	for _, table := range tables {
+		events = append(events, table.tick()...)
+	}
+	m.mu.Lock()
+	machines := make([]*Machine, 0, len(m.machines))
+	for _, machine := range m.machines {
+		machines = append(machines, machine)
+	}
+	m.mu.Unlock()
+	sort.Slice(machines, func(i, j int) bool {
+		if machines[i].RoomID != machines[j].RoomID {
+			return machines[i].RoomID < machines[j].RoomID
+		}
+		return machines[i].Config.ID < machines[j].Config.ID
+	})
+	for _, machine := range machines {
+		events = append(events, machine.tick()...)
+	}
+	return events
+}
+
+func (m *Manager) JoinMachine(roomID int, cfg MachineConfig, name string) []Event {
+	return m.EnsureMachine(roomID, cfg).join(name)
+}
+
+func (m *Manager) SetMachineBet(roomID int, machineID, name string, amount int) []Event {
+	m.mu.Lock()
+	machine := m.machines[tableKey(roomID, machineID)]
+	m.mu.Unlock()
+	if machine == nil {
+		return nil
+	}
+	return machine.setBet(name, amount)
+}
+
+func (m *Manager) StartMachine(roomID int, machineID, name string, wallet Wallet) []Event {
+	m.mu.Lock()
+	machine := m.machines[tableKey(roomID, machineID)]
+	m.mu.Unlock()
+	if machine == nil {
+		return nil
+	}
+	return machine.start(name, wallet)
+}
+
+func (m *Manager) EnableMachineAutoBet(roomID int, machineID, name string, wallet Wallet) []Event {
+	m.mu.Lock()
+	machine := m.machines[tableKey(roomID, machineID)]
+	m.mu.Unlock()
+	if machine == nil {
+		return nil
+	}
+	return machine.enableAutoBet(name, wallet)
+}
+
+func (m *Manager) StopMachineAutoBet(roomID int, machineID, name string) ([]Event, bool) {
+	m.mu.Lock()
+	machine := m.machines[tableKey(roomID, machineID)]
+	m.mu.Unlock()
+	if machine == nil {
+		return nil, false
+	}
+	return machine.stopAutoBet(name)
+}
+
+func (m *Manager) LeaveMachine(roomID int, machineID, name string) []Event {
+	m.mu.Lock()
+	machine := m.machines[tableKey(roomID, machineID)]
+	m.mu.Unlock()
+	if machine == nil {
+		return nil
+	}
+	return machine.leave(name)
+}
+
+func (m *Manager) Join(roomID int, cfg TableConfig, name string) []Event {
+	return m.EnsureTable(roomID, cfg).join(name)
+}
+
+func (m *Manager) Leave(roomID int, tableID, name string) []Event {
+	if table := m.Table(roomID, tableID); table != nil {
+		return table.leave(name)
+	}
+	return nil
+}
+
+func (m *Manager) Bet(roomID int, tableID, name string, amount int, wallet Wallet) []Event {
+	if table := m.Table(roomID, tableID); table != nil {
+		return table.bet(name, amount, wallet)
+	}
+	return []Event{{RoomID: roomID, TableID: tableID, Type: EventResult, Player: name, PrivateTo: name, Message: "That game is not available here."}}
+}
+
+func (m *Manager) MarkDisconnected(name string) []Event {
+	m.mu.Lock()
+	tables := make([]*Table, 0, len(m.tables))
+	for _, table := range m.tables {
+		tables = append(tables, table)
+	}
+	m.mu.Unlock()
+	var events []Event
+	for _, table := range tables {
+		events = append(events, table.markDisconnected(name)...)
+	}
+	m.mu.Lock()
+	machines := make([]*Machine, 0, len(m.machines))
+	for _, machine := range m.machines {
+		machines = append(machines, machine)
+	}
+	m.mu.Unlock()
+	for _, machine := range machines {
+		events = append(events, machine.markDisconnected(name)...)
+	}
+	return events
+}
+
+func (m *Manager) MarkConnected(name string) {
+	m.mu.Lock()
+	defer m.mu.Unlock()
+	for _, table := range m.tables {
+		table.markConnected(name)
+	}
+	for _, machine := range m.machines {
+		machine.markConnected(name)
+	}
+}
+
+func (m *Manager) Participation(name string) (*Table, bool) {
+	m.mu.Lock()
+	defer m.mu.Unlock()
+	for _, table := range m.tables {
+		if table.hasParticipant(name) {
+			return table, true
+		}
+	}
+	for _, machine := range m.machines {
+		if machine.hasParticipant(name) {
+			return nil, true
+		}
+	}
+	return nil, false
+}
+
+func (m *Manager) MachineFor(name string) (*Machine, bool) {
+	m.mu.Lock()
+	defer m.mu.Unlock()
+	for _, machine := range m.machines {
+		if machine.hasParticipant(name) {
+			return machine, true
+		}
+	}
+	return nil, false
+}
+
+func (m *Manager) MachineBusy(name string) bool {
+	m.mu.Lock()
+	defer m.mu.Unlock()
+	for _, machine := range m.machines {
+		if machine.isBusy(name) {
+			return true
+		}
+	}
+	return false
+}
diff --git a/internal/casino/manager_test.go b/internal/casino/manager_test.go
new file mode 100644
index 0000000..245133d
--- /dev/null
+++ b/internal/casino/manager_test.go
@@ -0,0 +1,103 @@
+package casino
+
+import "testing"
+
+type testWallet struct {
+	chips, credits, paid int
+}
+
+func (w *testWallet) Wager(amount int) (Wager, bool) {
+	if w.chips+w.credits < amount {
+		return Wager{}, false
+	}
+	chips := amount
+	if chips > w.chips {
+		chips = w.chips
+	}
+	w.chips -= chips
+	credits := amount - chips
+	w.credits -= credits
+	return Wager{Total: amount, Chips: chips, Credits: credits}, true
+}
+
+func (w *testWallet) PayCredits(amount int) {
+	w.paid += amount
+}
+
+func TestMixedWagerUsesChipsFirst(t *testing.T) {
+	w := &testWallet{chips: 7, credits: 50}
+	wager, ok := w.Wager(12)
+	if !ok || wager.Chips != 7 || wager.Credits != 5 || w.chips != 0 || w.credits != 45 {
+		t.Fatalf("unexpected wager: %+v wallet=%+v", wager, w)
+	}
+}
+
+func TestSoloBetResolvesImmediately(t *testing.T) {
+	m := NewManager(1)
+	cfg := TableConfig{ID: "slots", Game: GameSlots}
+	m.Join(1, cfg, "alice")
+	w := &testWallet{credits: 100}
+	events := m.Bet(1, "slots", "alice", 10, w)
+	found := false
+	for _, event := range events {
+		if event.Type == EventRoundStarted {
+			found = true
+		}
+	}
+	if !found {
+		t.Fatal("solo bet did not resolve immediately")
+	}
+}
+
+func TestMultiplePlayersWaitForBets(t *testing.T) {
+	m := NewManager(1)
+	cfg := TableConfig{ID: "slots", Game: GameSlots, BettingTicks: 2}
+	m.Join(1, cfg, "alice")
+	m.Join(1, cfg, "bob")
+	wa, wb := &testWallet{credits: 100}, &testWallet{credits: 100}
+	events := m.Bet(1, "slots", "alice", 10, wa)
+	for _, event := range events {
+		if event.Type == EventRoundStarted {
+			t.Fatal("round started before all players bet or timeout")
+		}
+	}
+	m.Bet(1, "slots", "bob", 10, wb)
+}
+
+func TestMachineAutobetCountdownAndStop(t *testing.T) {
+	m := NewManager(1)
+	cfg := MachineConfig{ID: "slots", Game: GameSlots, SpinTicks: 1}
+	m.JoinMachine(1, cfg, "alice")
+	m.SetMachineBet(1, "slots", "alice", 10)
+	w := &testWallet{credits: 100}
+	if events := m.EnableMachineAutoBet(1, "slots", "alice", w); len(events) != 0 {
+		t.Fatalf("enabling autobet emitted events before countdown: %+v", events)
+	}
+	for i, want := range []string{"Autobet enabled!", `Type "stop" to stop playing`, "Betting... 10 credits."} {
+		events := m.Tick()
+		if len(events) == 0 || eventText(events) != want {
+			t.Fatalf("tick %d message=%q events=%+v, want %q", i+1, eventText(events), events, want)
+		}
+	}
+	if !m.MachineBusy("alice") {
+		t.Fatal("autobet did not start a spin after countdown")
+	}
+	if events, stopped := m.StopMachineAutoBet(1, "slots", "alice"); !stopped || len(events) != 1 {
+		t.Fatalf("stop autobet events=%+v stopped=%v", events, stopped)
+	}
+	if _, playing := m.MachineFor("alice"); !playing {
+		t.Fatal("stopping autobet removed the player from the machine")
+	}
+}
+
+func eventText(events []Event) string {
+	for _, event := range events {
+		if event.PrivateMessage != "" {
+			return event.PrivateMessage
+		}
+		if event.Message != "" {
+			return event.Message
+		}
+	}
+	return ""
+}
diff --git a/internal/casino/slots.go b/internal/casino/slots.go
new file mode 100644
index 0000000..9d53bb1
--- /dev/null
+++ b/internal/casino/slots.go
@@ -0,0 +1,278 @@
+package casino
+
+import (
+	"fmt"
+	"math"
+	"math/rand"
+)
+
+type SlotSymbol struct {
+	ID     string          `yaml:"id"`
+	Weight int             `yaml:"weight"`
+	Payout map[int]float64 `yaml:"payout"`
+}
+
+type SlotProfile struct {
+	Symbols         []SlotSymbol `yaml:"symbols"`
+	Rows            int          `yaml:"rows"`
+	Reels           int          `yaml:"reels"`
+	FreeSpinTrigger string       `yaml:"free_spin_trigger"`
+	FreeSpinCount   int          `yaml:"free_spin_count"`
+	Ways            int          `yaml:"ways"`
+	TargetRTP       float64      `yaml:"payout"`
+}
+
+type SlotSpin struct {
+	Grid         [3][5]string
+	Payout       float64
+	ScatterCount int
+	Wins         []SlotWin
+}
+
+type SlotWin struct {
+	Symbol     string
+	Length     int
+	Ways       int
+	Multiplier float64
+	Payout     float64
+}
+
+// slotResult preserves the small rules-engine hook used by the unfinished
+// generic table implementation while slots move onto SlotMachine.
+type slotSpin struct {
+	Display string
+	Payout  int
+}
+
+func slotResult(rng *rand.Rand, bet int) slotSpin {
+	spin := generateSlotSpin(rng, bet)
+	return slotSpin{Display: spin.render(5), Payout: int(math.Floor(spin.Payout + 0.5))}
+}
+
+func DefaultHuffAndPuffProfile() SlotProfile {
+	return SlotProfile{
+		Rows: 3, Reels: 5, Ways: 243,
+		FreeSpinTrigger: "scatter", FreeSpinCount: 8,
+		Symbols: []SlotSymbol{
+			{ID: "straw", Weight: 22, Payout: map[int]float64{3: .5, 4: 1, 5: 2}},
+			{ID: "stick", Weight: 12, Payout: map[int]float64{3: 1, 4: 2, 5: 5}},
+			{ID: "brick", Weight: 7, Payout: map[int]float64{3: 2, 4: 5, 5: 15}},
+			{ID: "hat", Weight: 4, Payout: map[int]float64{3: 5, 4: 15, 5: 50}},
+			{ID: "wolf", Weight: 2, Payout: map[int]float64{3: 10, 4: 50, 5: 250}},
+			{ID: "scatter", Weight: 3},
+		},
+	}
+}
+
+func (p SlotProfile) Normalize() SlotProfile {
+	if p.Rows <= 0 {
+		p.Rows = 3
+	}
+	if p.Reels <= 0 {
+		p.Reels = 5
+	}
+	if p.Ways <= 0 {
+		p.Ways = 243
+	}
+	if p.FreeSpinCount <= 0 {
+		p.FreeSpinCount = 8
+	}
+	if len(p.Symbols) == 0 {
+		return DefaultHuffAndPuffProfile()
+	}
+	return p
+}
+
+func (p SlotProfile) symbol(id string) *SlotSymbol {
+	for i := range p.Symbols {
+		if p.Symbols[i].ID == id {
+			return &p.Symbols[i]
+		}
+	}
+	return nil
+}
+
+func generateSlotSpin(rng *rand.Rand, bet int) *SlotSpin {
+	return generateSlotSpinWithProfile(rng, bet, DefaultHuffAndPuffProfile())
+}
+
+func generateSlotSpinWithProfile(rng *rand.Rand, bet int, profile SlotProfile) *SlotSpin {
+	p := profile.Normalize()
+	spin := &SlotSpin{}
+	for reel := 0; reel < p.Reels && reel < 5; reel++ {
+		for row := 0; row < p.Rows && row < 3; row++ {
+			symbol := weightedSymbol(rng, p.Symbols)
+			spin.Grid[row][reel] = symbol
+			if symbol == p.FreeSpinTrigger {
+				spin.ScatterCount++
+			}
+		}
+	}
+	spin.Payout, spin.Wins = evaluateSlot(spin.Grid, bet, p)
+	return spin
+}
+
+func weightedSymbol(rng *rand.Rand, symbols []SlotSymbol) string {
+	total := 0
+	for _, symbol := range symbols {
+		if symbol.Weight > 0 {
+			total += symbol.Weight
+		}
+	}
+	if total <= 0 {
+		return ""
+	}
+	n := rng.Intn(total)
+	for _, symbol := range symbols {
+		if symbol.Weight <= 0 {
+			continue
+		}
+		if n < symbol.Weight {
+			return symbol.ID
+		}
+		n -= symbol.Weight
+	}
+	return symbols[len(symbols)-1].ID
+}
+
+func evaluateSlot(grid [3][5]string, bet int, profile SlotProfile) (float64, []SlotWin) {
+	p := profile.Normalize()
+	if bet <= 0 {
+		return 0, nil
+	}
+	total := 0.0
+	var wins []SlotWin
+	for _, symbol := range p.Symbols {
+		length, ways := matchingLength(grid, symbol.ID)
+		if length >= 3 && symbol.Payout[length] > 0 {
+			payout := float64(bet) * symbol.Payout[length] * float64(ways) / 243.0
+			total += payout
+			wins = append(wins, SlotWin{Symbol: symbol.ID, Length: length, Ways: ways, Multiplier: symbol.Payout[length], Payout: payout})
+		}
+	}
+	return total, wins
+}
+
+func matchingLength(grid [3][5]string, symbol string) (int, int) {
+	ways := 1
+	length := 0
+	for reel := 0; reel < 5; reel++ {
+		count := 0
+		for row := 0; row < 3; row++ {
+			if grid[row][reel] == symbol {
+				count++
+			}
+		}
+		if count == 0 {
+			break
+		}
+		ways *= count
+		length = reel + 1
+	}
+	if length < 3 {
+		return length, 0
+	}
+	return length, ways
+}
+
+func (s *SlotSpin) render(stoppedReels int) string {
+	var out string
+	out += "+---------+---------+---------+---------+---------+\n"
+	for row := 0; row < 3; row++ {
+		out += "|"
+		for reel := 0; reel < 5; reel++ {
+			value := "..."
+			if reel < stoppedReels {
+				value = s.Grid[row][reel]
+			}
+			out += fmt.Sprintf(" %-7s |", value)
+		}
+		out += "\n"
+	}
+	out += "+---------+---------+---------+---------+---------+"
+	return out
+}
+
+// CalculateRTP returns the exact mathematical RTP for the independent-cell
+// model used by the baseline machine, before integer-credit rounding.
+func CalculateRTP(profile SlotProfile) float64 {
+	p := profile.Normalize()
+	totalWeight := 0
+	for _, symbol := range p.Symbols {
+		if symbol.Weight > 0 {
+			totalWeight += symbol.Weight
+		}
+	}
+	if totalWeight == 0 {
+		return 0
+	}
+	baseRTP := 0.0
+	scatterProbability := 0.0
+	for _, symbol := range p.Symbols {
+		probability := float64(symbol.Weight) / float64(totalWeight)
+		if symbol.ID == p.FreeSpinTrigger {
+			scatterProbability = probability
+		}
+		if symbol.ID == p.FreeSpinTrigger {
+			continue
+		}
+		for length := 3; length <= 5; length++ {
+			ways := math.Pow(float64(p.Rows), float64(length))
+			nextReelNoMatch := 1.0
+			if length < 5 {
+				nextReelNoMatch = math.Pow(1-probability, float64(p.Rows))
+			}
+			baseRTP += symbol.Payout[length] * ways * math.Pow(probability, float64(length)) * nextReelNoMatch / float64(p.Ways)
+		}
+	}
+	// The baseline feature awards a fixed number of automatic spins and does
+	// not retrigger during those spins. Its expected value is therefore the
+	// trigger probability multiplied by the free-spin count and base RTP.
+	triggerProbability := 0.0
+	for scatters := 3; scatters <= p.Rows*p.Reels; scatters++ {
+		triggerProbability += binomial(p.Rows*p.Reels, scatters) * math.Pow(scatterProbability, float64(scatters)) * math.Pow(1-scatterProbability, float64(p.Rows*p.Reels-scatters))
+	}
+	return baseRTP * (1 + triggerProbability*float64(p.FreeSpinCount))
+}
+
+func binomial(n, k int) float64 {
+	if k < 0 || k > n {
+		return 0
+	}
+	result := 1.0
+	for i := 1; i <= k; i++ {
+		result *= float64(n-k+i) / float64(i)
+	}
+	return result
+}
+
+func ValidateRTP(profile SlotProfile, tolerance float64) error {
+	if profile.TargetRTP <= 0 {
+		return nil
+	}
+	actual := CalculateRTP(profile)
+	if math.Abs(actual-profile.TargetRTP) > tolerance {
+		return fmt.Errorf("slot profile RTP %.6f does not match target %.6f", actual, profile.TargetRTP)
+	}
+	return nil
+}
+
+// ScaleToRTP adjusts the configured paytable, without changing reel weights or
+// feature probabilities, so the profile's exact mathematical RTP reaches the
+// requested target. Runtime payouts retain fractional credits internally until
+// they can be paid as whole credits.
+func ScaleToRTP(profile SlotProfile, target float64) SlotProfile {
+	profile = profile.Normalize()
+	actual := CalculateRTP(profile)
+	if actual <= 0 || target <= 0 {
+		return profile
+	}
+	scale := target / actual
+	for i := range profile.Symbols {
+		for length, payout := range profile.Symbols[i].Payout {
+			profile.Symbols[i].Payout[length] = payout * scale
+		}
+	}
+	profile.TargetRTP = target
+	return profile
+}
diff --git a/internal/casino/slots_test.go b/internal/casino/slots_test.go
new file mode 100644
index 0000000..22e39bf
--- /dev/null
+++ b/internal/casino/slots_test.go
@@ -0,0 +1,44 @@
+package casino
+
+import "testing"
+
+func TestCalculateRTPUsesLongestWayOnly(t *testing.T) {
+	profile := SlotProfile{
+		Rows: 3, Reels: 5, Ways: 243,
+		Symbols:         []SlotSymbol{{ID: "x", Weight: 1, Payout: map[int]float64{3: 1, 4: 2, 5: 3}}},
+		FreeSpinTrigger: "scatter", FreeSpinCount: 8,
+	}
+	if got := CalculateRTP(profile); got != 3 {
+		t.Fatalf("RTP = %v, want 3", got)
+	}
+}
+
+func TestValidateRTP(t *testing.T) {
+	profile := SlotProfile{Rows: 3, Reels: 5, Ways: 243, TargetRTP: 3,
+		Symbols: []SlotSymbol{{ID: "x", Weight: 1, Payout: map[int]float64{5: 3}}}}
+	if err := ValidateRTP(profile, 0.000001); err != nil {
+		t.Fatal(err)
+	}
+}
+
+func TestScaleToRTP(t *testing.T) {
+	profile := ScaleToRTP(DefaultHuffAndPuffProfile(), 0.97)
+	if err := ValidateRTP(profile, 0.000000001); err != nil {
+		t.Fatal(err)
+	}
+}
+
+func TestEvaluateSlotReportsWinningWays(t *testing.T) {
+	profile := SlotProfile{Rows: 3, Reels: 5, Ways: 243,
+		Symbols: []SlotSymbol{{ID: "x", Weight: 1, Payout: map[int]float64{5: 2}}}}
+	grid := [3][5]string{}
+	for row := range grid {
+		for reel := range grid[row] {
+			grid[row][reel] = "x"
+		}
+	}
+	payout, wins := evaluateSlot(grid, 10, profile)
+	if payout != 20 || len(wins) != 1 || wins[0].Ways != 243 || wins[0].Length != 5 {
+		t.Fatalf("payout=%v wins=%+v", payout, wins)
+	}
+}
diff --git a/internal/casino/table.go b/internal/casino/table.go
new file mode 100644
index 0000000..1b9d0b5
--- /dev/null
+++ b/internal/casino/table.go
@@ -0,0 +1,217 @@
+package casino
+
+import (
+	"fmt"
+	"math/rand"
+	"sync"
+)
+
+type tablePhase string
+
+const (
+	phaseWaiting tablePhase = "waiting"
+	phaseBetting tablePhase = "betting"
+)
+
+type Table struct {
+	mu     sync.Mutex
+	RoomID int
+	Config TableConfig
+
+	participants map[string]*Participant
+	order        []string
+	phase        tablePhase
+	deadline     int
+	clock        int
+	rng          *rand.Rand
+}
+
+func newTable(roomID int, cfg TableConfig, rng *rand.Rand) *Table {
+	return &Table{
+		RoomID:       roomID,
+		Config:       cfg,
+		phase:        phaseWaiting,
+		participants: make(map[string]*Participant),
+		rng:          rng,
+	}
+}
+
+func (t *Table) join(name string) []Event {
+	t.mu.Lock()
+	defer t.mu.Unlock()
+	if p := t.participants[name]; p != nil {
+		p.Connected = true
+		return []Event{{RoomID: t.RoomID, TableID: t.Config.ID, Type: EventJoined, Player: name, PrivateTo: name, Message: fmt.Sprintf("You resume your place at the %s table.", t.Config.ID)}}
+	}
+	if len(t.participants) >= t.Config.MaxPlayers {
+		return []Event{{RoomID: t.RoomID, TableID: t.Config.ID, Type: EventResult, Player: name, PrivateTo: name, Message: "That table is full."}}
+	}
+	t.participants[name] = &Participant{Name: name, Connected: true}
+	t.order = append(t.order, name)
+	return []Event{{RoomID: t.RoomID, TableID: t.Config.ID, Type: EventJoined, Player: name, Message: fmt.Sprintf("%s joins the %s table.", name, t.Config.ID), Public: true}}
+}
+
+func (t *Table) leave(name string) []Event {
+	t.mu.Lock()
+	defer t.mu.Unlock()
+	p := t.participants[name]
+	if p == nil {
+		return nil
+	}
+	if t.phase != phaseWaiting {
+		return []Event{{RoomID: t.RoomID, TableID: t.Config.ID, Type: EventResult, Player: name, PrivateTo: name, Message: "You're in the middle of a game!"}}
+	}
+	delete(t.participants, name)
+	for i, n := range t.order {
+		if n == name {
+			t.order = append(t.order[:i], t.order[i+1:]...)
+			break
+		}
+	}
+	events := []Event{{RoomID: t.RoomID, TableID: t.Config.ID, Type: EventLeft, Player: name, Message: fmt.Sprintf("%s stops playing at the %s table.", name, t.Config.ID), Public: true}}
+	if len(t.participants) == 0 {
+		events = append(events, Event{RoomID: t.RoomID, TableID: t.Config.ID, Type: EventClosed, Message: fmt.Sprintf("The %s table closes.", t.Config.ID), Public: true})
+	}
+	return events
+}
+
+func (t *Table) bet(name string, amount int, wallet Wallet) []Event {
+	t.mu.Lock()
+	defer t.mu.Unlock()
+	p := t.participants[name]
+	if p == nil {
+		return []Event{{RoomID: t.RoomID, TableID: t.Config.ID, Type: EventResult, Player: name, PrivateTo: name, Message: "You aren't playing at that table."}}
+	}
+	if t.phase != phaseWaiting && t.phase != phaseBetting {
+		return []Event{{RoomID: t.RoomID, TableID: t.Config.ID, Type: EventResult, Player: name, PrivateTo: name, Message: "That table isn't accepting bets."}}
+	}
+	if amount < t.Config.MinBet || amount > t.Config.MaxBet {
+		return []Event{{RoomID: t.RoomID, TableID: t.Config.ID, Type: EventResult, Player: name, PrivateTo: name, Message: fmt.Sprintf("Bets must be between %d and %d.", t.Config.MinBet, t.Config.MaxBet)}}
+	}
+	if p.HasBet {
+		return []Event{{RoomID: t.RoomID, TableID: t.Config.ID, Type: EventResult, Player: name, PrivateTo: name, Message: "You have already bet this round."}}
+	}
+	wager, ok := wallet.Wager(amount)
+	if !ok {
+		return []Event{{RoomID: t.RoomID, TableID: t.Config.ID, Type: EventResult, Player: name, PrivateTo: name, Message: "You don't have enough chips and credits for that bet."}}
+	}
+	p.HasBet = true
+	p.Wager = wager
+	p.Wallet = wallet
+	if t.phase == phaseWaiting && len(t.participants) > 1 {
+		t.phase = phaseBetting
+		t.clock = 0
+		t.deadline = t.Config.BettingTicks
+	}
+	events := []Event{{RoomID: t.RoomID, TableID: t.Config.ID, Type: EventBetPlaced, Player: name, Message: fmt.Sprintf("%s bets %d credits at the %s table.", name, amount, t.Config.ID), Public: true}}
+	if t.phase == phaseBetting && t.clock == 0 {
+		events = append(events, Event{RoomID: t.RoomID, TableID: t.Config.ID, Type: EventBetting, Message: fmt.Sprintf("Betting is open at the %s table for %d ticks.", t.Config.ID, t.deadline), Public: true})
+	}
+	if len(t.participants) == 1 || t.allBet() {
+		events = append(events, t.resolveRound()...)
+	}
+	return events
+}
+
+func (t *Table) tick() []Event {
+	t.mu.Lock()
+	defer t.mu.Unlock()
+	if t.phase != phaseBetting {
+		return nil
+	}
+	t.clock++
+	if t.allBet() {
+		return t.resolveRound()
+	}
+	if t.clock < t.deadline {
+		return nil
+	}
+	var events []Event
+	for _, name := range t.order {
+		p := t.participants[name]
+		if p != nil && !p.HasBet {
+			events = append(events, Event{RoomID: t.RoomID, TableID: t.Config.ID, Type: EventTimedOut, Player: name, Message: fmt.Sprintf("%s sits out this round.", name), Public: true})
+		}
+	}
+	if t.anyBet() {
+		events = append(events, t.resolveRound()...)
+	} else {
+		t.resetRound()
+	}
+	return events
+}
+
+func (t *Table) resolveRound() []Event {
+	var events []Event
+	for _, name := range t.order {
+		p := t.participants[name]
+		if p == nil || !p.HasBet {
+			continue
+		}
+		result := slotResult(t.rng, p.Wager.Total)
+		message := fmt.Sprintf("%s spins: %s", name, result.Display)
+		events = append(events, Event{RoomID: t.RoomID, TableID: t.Config.ID, Type: EventRoundStarted, Player: name, Message: message, Public: true})
+		if result.Payout > 0 {
+			if p.Wallet != nil {
+				p.Wallet.PayCredits(result.Payout)
+			}
+			events = append(events, Event{RoomID: t.RoomID, TableID: t.Config.ID, Type: EventPayout, Player: name, PrivateTo: name, Message: fmt.Sprintf("You win %d credits!", result.Payout)})
+		}
+	}
+	t.resetRound()
+	return events
+}
+
+func (t *Table) resetRound() {
+	t.phase = phaseWaiting
+	t.clock = 0
+	t.deadline = 0
+	for _, p := range t.participants {
+		p.HasBet = false
+		p.Wager = Wager{}
+	}
+}
+
+func (t *Table) allBet() bool {
+	if len(t.participants) == 0 {
+		return false
+	}
+	for _, p := range t.participants {
+		if !p.HasBet {
+			return false
+		}
+	}
+	return true
+}
+
+func (t *Table) anyBet() bool {
+	for _, p := range t.participants {
+		if p.HasBet {
+			return true
+		}
+	}
+	return false
+}
+
+func (t *Table) markDisconnected(name string) []Event {
+	t.mu.Lock()
+	defer t.mu.Unlock()
+	if p := t.participants[name]; p != nil {
+		p.Connected = false
+	}
+	return nil
+}
+
+func (t *Table) markConnected(name string) {
+	t.mu.Lock()
+	defer t.mu.Unlock()
+	if p := t.participants[name]; p != nil {
+		p.Connected = true
+	}
+}
+
+func (t *Table) hasParticipant(name string) bool {
+	t.mu.Lock()
+	defer t.mu.Unlock()
+	return t.participants[name] != nil
+}
diff --git a/internal/casino/types.go b/internal/casino/types.go
new file mode 100644
index 0000000..f284869
--- /dev/null
+++ b/internal/casino/types.go
@@ -0,0 +1,121 @@
+package casino
+
+import "fmt"
+
+type GameName string
+
+const (
+	GameSlots GameName = "slots"
+)
+
+type TableConfig struct {
+	ID           string   `yaml:"id"`
+	Game         GameName `yaml:"game"`
+	MaxPlayers   int      `yaml:"max_players,omitempty"`
+	BettingTicks int      `yaml:"betting_ticks,omitempty"`
+	MinBet       int      `yaml:"min_bet,omitempty"`
+	MaxBet       int      `yaml:"max_bet,omitempty"`
+}
+
+type MachineConfig struct {
+	ID        string   `yaml:"id"`
+	Game      GameName `yaml:"game"`
+	Variant   string   `yaml:"variant,omitempty"`
+	MinBet    int      `yaml:"min_bet,omitempty"`
+	MaxBet    int      `yaml:"max_bet,omitempty"`
+	SpinTicks int      `yaml:"spin_ticks,omitempty"`
+	Payout    float64  `yaml:"payout,omitempty"`
+}
+
+func (c MachineConfig) Normalize() MachineConfig {
+	if c.MinBet <= 0 {
+		c.MinBet = 1
+	}
+	if c.MaxBet <= 0 {
+		c.MaxBet = int(^uint(0) >> 1)
+	}
+	if c.SpinTicks <= 0 {
+		c.SpinTicks = 2
+	}
+	if c.Variant == "" {
+		c.Variant = "huff_and_even_more_puff"
+	}
+	if c.Payout <= 0 {
+		c.Payout = 0.97
+	}
+	return c
+}
+
+func (c TableConfig) Normalize() TableConfig {
+	if c.MaxPlayers <= 0 {
+		c.MaxPlayers = 8
+	}
+	if c.BettingTicks <= 0 {
+		c.BettingTicks = 20
+	}
+	if c.MinBet <= 0 {
+		c.MinBet = 1
+	}
+	if c.MaxBet <= 0 {
+		c.MaxBet = int(^uint(0) >> 1)
+	}
+	return c
+}
+
+type Wager struct {
+	Total   int
+	Chips   int
+	Credits int
+}
+
+type Wallet interface {
+	Wager(amount int) (Wager, bool)
+	PayCredits(amount int)
+}
+
+type EventType string
+
+const (
+	EventJoined       EventType = "joined"
+	EventBetting      EventType = "betting"
+	EventBetPlaced    EventType = "bet_placed"
+	EventRoundStarted EventType = "round_started"
+	EventResult       EventType = "result"
+	EventPayout       EventType = "payout"
+	EventTimedOut     EventType = "timed_out"
+	EventLeft         EventType = "left"
+	EventClosed       EventType = "closed"
+)
+
+type Event struct {
+	RoomID         int
+	TableID        string
+	Type           EventType
+	Player         string
+	Message        string
+	PrivateMessage string
+	PrivateTo      string
+	Color          string
+	Public         bool
+	Slot           *SlotSnapshot
+}
+
+type SlotSnapshot struct {
+	Grid         [3][5]string
+	StoppedReels int
+}
+
+func (e Event) String() string {
+	if e.Message != "" {
+		return e.Message
+	}
+	return fmt.Sprintf("%s at %s", e.Type, e.TableID)
+}
+
+type Participant struct {
+	Name      string
+	Connected bool
+	HasBet    bool
+	Wager     Wager
+	Wallet    Wallet
+}
diff --git a/internal/game/act_effects.go b/internal/game/act_effects.go
index cadd05e..d1effac 100644
--- a/internal/game/act_effects.go
+++ b/internal/game/act_effects.go
@@ -177,7 +177,12 @@ func (g *Game) applyStep(sess *net.Session, p *player.Player, step *behavior.Ste
 		}
 	}
 
-	// 11/12. spawn_mob / despawn_mob (player-owned / owner-filtered).
+	// 11. casino game join. The table is resolved from the player's current room.
+	if step.StartGame != "" {
+		g.startCasinoGame(sess, p, step.StartGame)
+	}
+
+	// 12/13. spawn_mob / despawn_mob (player-owned / owner-filtered).
 	if step.SpawnMob != nil {
 		g.spawnTriggerMob(sess, p, step.SpawnMob, roomID)
 	}
diff --git a/internal/game/casino.go b/internal/game/casino.go
new file mode 100644
index 0000000..c6fb63b
--- /dev/null
+++ b/internal/game/casino.go
@@ -0,0 +1,319 @@
+package game
+
+import (
+	"fmt"
+	"strconv"
+	"strings"
+
+	"thehouseoficarus/internal/casino"
+	"thehouseoficarus/internal/color"
+	"thehouseoficarus/internal/net"
+	"thehouseoficarus/internal/player"
+)
+
+type casinoWallet struct {
+	g *Game
+	p *player.Player
+}
+
+func (w casinoWallet) Wager(amount int) (casino.Wager, bool) {
+	chips := countChips(w.p)
+	if chips > amount {
+		chips = amount
+	}
+	credits := amount - chips
+	if w.p.Credits < credits {
+		return casino.Wager{}, false
+	}
+	if chips > 0 {
+		w.p.RemoveItem("chips", chips)
+	}
+	w.p.Credits -= credits
+	w.g.AccountStore.SaveCharacter(w.p)
+	return casino.Wager{Total: amount, Chips: chips, Credits: credits}, true
+}
+
+func (w casinoWallet) PayCredits(amount int) {
+	w.p.Credits += amount
+	w.g.AccountStore.SaveCharacter(w.p)
+}
+
+func (g *Game) casinoTable(roomID int, gameName string) (*casino.Table, bool) {
+	room, err := g.World.LoadRoom(roomID)
+	if err != nil {
+		return nil, false
+	}
+	for _, cfg := range room.CasinoTables {
+		if strings.EqualFold(string(cfg.Game), gameName) {
+			return g.Casino.EnsureTable(roomID, cfg), true
+		}
+	}
+	return nil, false
+}
+
+func (g *Game) casinoMachine(roomID int, gameName string) (*casino.Machine, bool) {
+	room, err := g.World.LoadRoom(roomID)
+	if err != nil {
+		return nil, false
+	}
+	for _, cfg := range room.CasinoMachines {
+		if strings.EqualFold(string(cfg.Game), gameName) || strings.EqualFold(cfg.Variant, gameName) {
+			return g.Casino.EnsureMachine(roomID, cfg), true
+		}
+	}
+	// Migrate older room definitions that declared slots under casino_tables;
+	// slots are still always instantiated as one-player machines.
+	if strings.EqualFold(gameName, "slots") {
+		for _, cfg := range room.CasinoTables {
+			if strings.EqualFold(string(cfg.Game), "slots") {
+				return g.Casino.EnsureMachine(roomID, casino.MachineConfig{
+					ID: cfg.ID, Game: casino.GameSlots, MinBet: cfg.MinBet, MaxBet: cfg.MaxBet,
+				}), true
+			}
+		}
+	}
+	return nil, false
+}
+
+func (g *Game) executePlay(sess *net.Session, args []string, rawInput string) {
+	p := sess.Player
+	if p == nil || len(args) == 0 {
+		sess.WriteLine("Play what?")
+		return
+	}
+	if _, playing := g.Casino.Participation(p.Name); playing {
+		sess.WriteLine("You're already playing a game. Type \"stop\" between rounds to leave it.")
+		return
+	}
+	g.startCasinoGame(sess, p, args[0])
+}
+
+func (g *Game) startCasinoGame(sess *net.Session, p *player.Player, gameName string) {
+	if p == nil || sess == nil {
+		return
+	}
+	if _, playing := g.Casino.Participation(p.Name); playing {
+		sess.WriteLine("You're already playing a game. Type \"stop\" between rounds to leave it.")
+		return
+	}
+	if machine, ok := g.casinoMachine(p.RoomID, gameName); ok {
+		g.emitCasinoEvents(g.Casino.JoinMachine(machine.RoomID, machine.Config, p.Name))
+		return
+	}
+	table, ok := g.casinoTable(p.RoomID, gameName)
+	if !ok {
+		sess.WriteLine(fmt.Sprintf("There is no %s table here.", gameName))
+		return
+	}
+	g.emitCasinoEvents(g.Casino.Join(table.RoomID, table.Config, p.Name))
+}
+
+func (g *Game) executeBet(sess *net.Session, args []string, rawInput string) {
+	p := sess.Player
+	if p == nil {
+		sess.WriteLine("Bet how much?")
+		return
+	}
+	if machine, ok := g.Casino.MachineFor(p.Name); ok {
+		if len(args) == 0 {
+			g.emitCasinoEvents(g.Casino.StartMachine(machine.RoomID, machine.Config.ID, p.Name, casinoWallet{g: g, p: p}))
+			return
+		}
+		if len(args) == 1 && args[0] == "max" {
+			g.emitCasinoEvents(g.Casino.SetMachineBet(machine.RoomID, machine.Config.ID, p.Name, machine.Config.MaxBet))
+			return
+		}
+		if len(args) == 1 {
+			if amount, err := strconv.Atoi(args[0]); err == nil && amount > 0 {
+				g.emitCasinoEvents(g.Casino.SetMachineBet(machine.RoomID, machine.Config.ID, p.Name, amount))
+				return
+			}
+		}
+		g.emitCasinoEvents(g.Casino.StartMachine(machine.RoomID, machine.Config.ID, p.Name, casinoWallet{g: g, p: p}))
+		return
+	}
+	if len(args) == 0 {
+		sess.WriteLine("Bet how much?")
+		return
+	}
+	amount, err := strconv.Atoi(args[0])
+	if err != nil || amount <= 0 {
+		sess.WriteLine("Your bet must be a positive whole number.")
+		return
+	}
+	table, playing := g.Casino.Participation(p.Name)
+	if !playing {
+		sess.WriteLine("You're not playing a game.")
+		return
+	}
+	g.emitCasinoEvents(g.Casino.Bet(table.RoomID, table.Config.ID, p.Name, amount, casinoWallet{g: g, p: p}))
+}
+
+func (g *Game) executeAutoBet(sess *net.Session, args []string, rawInput string) {
+	p := sess.Player
+	if p == nil {
+		return
+	}
+	if machine, ok := g.Casino.MachineFor(p.Name); ok {
+		g.emitCasinoEvents(g.Casino.EnableMachineAutoBet(machine.RoomID, machine.Config.ID, p.Name, casinoWallet{g: g, p: p}))
+		return
+	}
+	sess.WriteLine("Autobet is only available at games without player choices.")
+}
+
+func (g *Game) CasinoTick() {
+	if g.Casino != nil {
+		g.emitCasinoEvents(g.Casino.Tick())
+	}
+}
+
+func (g *Game) emitCasinoEvents(events []casino.Event) {
+	for _, event := range events {
+		if event.Message == "" {
+			continue
+		}
+		category := event.Color
+		if category == "" {
+			category = casinoEventColor(event.Type)
+		}
+		if event.Public && g.Hub != nil {
+			for _, sess := range g.Hub.PlayersInRoom(event.RoomID) {
+				if event.PrivateTo != "" && sess.Player != nil && sess.Player.Name == event.PrivateTo {
+					continue
+				}
+				message := event.Message
+				if category == "casino_menu" && sess.Player != nil && sess.Player.Name == event.PrivateTo {
+					message = g.casinoMenuBalance(sess, message)
+				}
+				if event.Slot != nil && sess.Player != nil {
+					message += "\n" + renderSlotSnapshot(event.Slot, g.colorMode(sess), sess.Player.OptionBool("unicode"))
+				}
+				sess.WriteLine(g.colorize(sess, category, message))
+			}
+		}
+		if event.PrivateMessage != "" && event.PrivateTo != "" {
+			g.charsMu.Lock()
+			sess := g.loggedInChars[event.PrivateTo]
+			g.charsMu.Unlock()
+			if sess != nil {
+				privateMessage := event.PrivateMessage
+				if category == "casino_menu" {
+					privateMessage = g.casinoMenuBalance(sess, privateMessage)
+				}
+				sess.WriteLine(g.colorize(sess, category, privateMessage))
+				if category == "casino_menu" {
+					g.writePrompt(sess)
+				}
+			}
+		}
+		if event.PrivateTo != "" {
+			g.charsMu.Lock()
+			sess := g.loggedInChars[event.PrivateTo]
+			g.charsMu.Unlock()
+			if sess != nil && event.PrivateMessage == "" {
+				privateMessage := event.Message
+				if category == "casino_menu" {
+					privateMessage = g.casinoMenuBalance(sess, privateMessage)
+				}
+				sess.WriteLine(g.colorize(sess, category, privateMessage))
+				if category == "casino_menu" {
+					g.writePrompt(sess)
+				}
+			}
+		}
+	}
+}
+
+func casinoEventColor(eventType casino.EventType) string {
+	if eventType == casino.EventPayout {
+		return "casino_win"
+	}
+	return "casino_action"
+}
+
+func (g *Game) casinoMenuBalance(sess *net.Session, message string) string {
+	if sess == nil || sess.Player == nil {
+		return message
+	}
+	chips := g.colorize(sess, "casino_chips", fmt.Sprintf("%d", countChips(sess.Player)))
+	credits := g.colorize(sess, "casino_credits", fmt.Sprintf("%d", sess.Player.Credits))
+	line := fmt.Sprintf("You have %s chips and %s credits.", chips, credits)
+	return strings.Replace(message, "Slot machine commands:", line+"\n\nSlot machine commands:", 1)
+}
+
+func renderSlotSnapshot(snapshot *casino.SlotSnapshot, mode string, unicode bool) string {
+	if snapshot == nil {
+		return ""
+	}
+	left, junction, right, horizontal, vertical := '+', '+', '+', '-', '|'
+	bottomLeft, bottomJunction, bottomRight := '+', '+', '+'
+	if unicode {
+		left, junction, right, horizontal, vertical = '\u250c', '\u252c', '\u2510', '\u2500', '\u2502'
+		bottomLeft, bottomJunction, bottomRight = '\u2514', '\u2534', '\u2518'
+	}
+	separator := string(left)
+	for reel := 0; reel < 5; reel++ {
+		if reel > 0 {
+			separator += string(junction)
+		}
+		separator += strings.Repeat(string(horizontal), 9)
+	}
+	separator += string(right)
+	lines := []string{casinoFrame(mode, separator)}
+	frameVertical := casinoFrame(mode, string(vertical))
+	for row := 0; row < 3; row++ {
+		line := frameVertical
+		for reel := 0; reel < 5; reel++ {
+			value := "..."
+			if reel < snapshot.StoppedReels {
+				value = snapshot.Grid[row][reel]
+			}
+			line += " " + colorSlotSymbol(mode, value) + strings.Repeat(" ", 7-len(value)) + " " + frameVertical
+		}
+		lines = append(lines, line)
+	}
+	bottom := string(bottomLeft)
+	for reel := 0; reel < 5; reel++ {
+		if reel > 0 {
+			bottom += string(bottomJunction)
+		}
+		bottom += strings.Repeat(string(horizontal), 9)
+	}
+	bottom += string(bottomRight)
+	lines = append(lines, casinoFrame(mode, bottom))
+	return strings.Join(lines, "\n")
+}
+
+func casinoFrame(mode, text string) string {
+	spec := color.NoColor()
+	spec.Fg = 244
+	return color.Render(mode, spec, text)
+}
+
+func colorSlotSymbol(mode, symbol string) string {
+	spec := color.NoColor()
+	spec.Fg = 250
+	switch symbol {
+	case "straw":
+		spec = color.NoColor()
+		spec.Gradient = []int{220, 226}
+	case "stick":
+		spec = color.NoColor()
+		spec.Gradient = []int{34, 46}
+	case "brick":
+		spec = color.NoColor()
+		spec.Gradient = []int{160, 196}
+	case "hat":
+		spec = color.NoColor()
+		spec.Gradient = []int{129, 201}
+	case "wolf":
+		spec = color.NoColor()
+		spec.Gradient = []int{27, 39}
+	case "scatter":
+		spec = color.NoColor()
+		spec.Gradient = []int{196, 220, 46, 51, 129, 201}
+	default:
+		spec.Dim = true
+	}
+	return color.Render(mode, spec, symbol)
+}
diff --git a/internal/game/casino_test.go b/internal/game/casino_test.go
new file mode 100644
index 0000000..b2b37c4
--- /dev/null
+++ b/internal/game/casino_test.go
@@ -0,0 +1,29 @@
+package game
+
+import (
+	"strings"
+	"testing"
+
+	"thehouseoficarus/internal/casino"
+	"thehouseoficarus/internal/color"
+)
+
+func TestRenderSlotSnapshotColorsWordSymbols(t *testing.T) {
+	snapshot := &casino.SlotSnapshot{StoppedReels: 1}
+	snapshot.Grid[0][0] = "scatter"
+	if !strings.Contains(renderSlotSnapshot(snapshot, "none", false), "scatter") {
+		t.Fatal("expected word-based slot symbols")
+	}
+	output := renderSlotSnapshot(snapshot, "xterm256", true)
+	if !strings.Contains(output, "\033[38;5;") {
+		t.Fatalf("expected colored slot symbols, got %q", output)
+	}
+	for _, line := range strings.Split(output, "\n") {
+		if color.VisibleLen(line) != 51 {
+			t.Fatalf("line visible width = %d, want 51: %q", color.VisibleLen(line), line)
+		}
+	}
+	if !strings.Contains(output, "┌") || !strings.Contains(output, "└") {
+		t.Fatalf("slot output lacks the Unicode frame: %q", output)
+	}
+}
diff --git a/internal/game/cmd_move.go b/internal/game/cmd_move.go
index 761db2f..4772a2c 100644
--- a/internal/game/cmd_move.go
+++ b/internal/game/cmd_move.go
@@ -13,6 +13,10 @@ import (
 
 func (g *Game) doMove(sess *net.Session, dir string, isWalk bool) {
 	p := sess.Player
+	if _, playing := g.Casino.Participation(p.Name); playing {
+		sess.WriteLine("You're playing a game. Type \"stop\" between rounds before moving.")
+		return
+	}
 	exitDir := g.World.ResolveExit(dir)
 	if exitDir == "" {
 		sess.WriteLine("Go where?")
diff --git a/internal/game/cmd_quit.go b/internal/game/cmd_quit.go
index 12d3879..b7ec972 100644
--- a/internal/game/cmd_quit.go
+++ b/internal/game/cmd_quit.go
@@ -11,6 +11,10 @@ func (g *Game) executeQuit(sess *net.Session, args []string, rawInput string) {
 
 func (g *Game) doQuit(sess *net.Session) {
 	p := sess.Player
+	if _, playing := g.Casino.Participation(p.Name); playing {
+		sess.WriteLine(g.colorize(sess, "warning", "WARNING: You're in the middle of a game!"))
+		g.emitCasinoEvents(g.Casino.MarkDisconnected(p.Name))
+	}
 
 	if g.Combat.Get(p.Name) != nil {
 		sess.WriteLine("You can't rest during combat!")
diff --git a/internal/game/cmd_registry.go b/internal/game/cmd_registry.go
index d03993a..4c41216 100644
--- a/internal/game/cmd_registry.go
+++ b/internal/game/cmd_registry.go
@@ -23,6 +23,11 @@ var commandRegistry = map[string]commandDef{
 	"attack":        {(*Game).executeAttack, ClassActive},
 	"kill":          {(*Game).executeAttack, ClassActive},
 	"work":          {(*Game).executeWork, ClassActive},
+	"play":          {(*Game).executePlay, ClassActive},
+	"bet":           {(*Game).executeBet, ClassActive},
+	"spin":          {(*Game).executeBet, ClassActive},
+	"autobet":       {(*Game).executeAutoBet, ClassActive},
+	"autospin":      {(*Game).executeAutoBet, ClassActive},
 	"style":         {(*Game).executeStyle, ClassInstant},
 	"look":          {(*Game).executeLook, ClassInstant},
 	"l":             {(*Game).executeLook, ClassInstant},
diff --git a/internal/game/cmd_stop.go b/internal/game/cmd_stop.go
index d1b8faa..5c347e6 100644
--- a/internal/game/cmd_stop.go
+++ b/internal/game/cmd_stop.go
@@ -6,6 +6,18 @@ import (
 
 func (g *Game) executeStop(sess *net.Session, args []string, rawInput string) {
 	p := sess.Player
+	if table, playing := g.Casino.Participation(p.Name); playing {
+		if table != nil {
+			g.emitCasinoEvents(g.Casino.Leave(table.RoomID, table.Config.ID, p.Name))
+		} else if machine, ok := g.Casino.MachineFor(p.Name); ok {
+			if events, stopped := g.Casino.StopMachineAutoBet(machine.RoomID, machine.Config.ID, p.Name); stopped {
+				g.emitCasinoEvents(events)
+				return
+			}
+			g.emitCasinoEvents(g.Casino.LeaveMachine(machine.RoomID, machine.Config.ID, p.Name))
+		}
+		return
+	}
 	ss, _ := g.safespot.Get(p.Name)
 	if p.Action == nil && p.BackgroundAction == nil && g.Combat.Get(p.Name) == nil && p.MoveTicks == 0 && len(p.WalkSequence) == 0 && !ss.Active {
 		sess.WriteLine("You're not doing anything.")
diff --git a/internal/game/core_login_char.go b/internal/game/core_login_char.go
index 38499e2..4f59f1b 100644
--- a/internal/game/core_login_char.go
+++ b/internal/game/core_login_char.go
@@ -108,6 +108,7 @@ func (g *Game) connectCharacter(sess *net.Session, name string) {
 	if g.Hub != nil {
 		g.Hub.EnterRoom(sess, p.RoomID)
 	}
+	g.Casino.MarkConnected(name)
 
 	g.doLook(sess)
 	g.checkAggro(sess)
diff --git a/internal/game/game.go b/internal/game/game.go
index 700877b..cac0ec9 100644
--- a/internal/game/game.go
+++ b/internal/game/game.go
@@ -7,6 +7,7 @@ import (
 	"sync"
 	"time"
 
+	"thehouseoficarus/internal/casino"
 	"thehouseoficarus/internal/combat"
 	"thehouseoficarus/internal/config"
 	"thehouseoficarus/internal/engine"
@@ -31,13 +32,13 @@ const (
 // constructed once at startup and never replaced. Deps is embedded in Game, so
 // game code accesses them directly (e.g. g.World, g.ItemStore).
 type Deps struct {
-	World        *world.World
-	ObjectStore  *object.ObjectStore
-	ItemStore    *item.ItemStore
-	AccountStore *player.AccountStore
-	MobStore     *world.MobStore
-	CraftIndex   *CraftIndex
-	CourseStore  *CourseStore
+	World               *world.World
+	ObjectStore         *object.ObjectStore
+	ItemStore           *item.ItemStore
+	AccountStore        *player.AccountStore
+	MobStore            *world.MobStore
+	CraftIndex          *CraftIndex
+	CourseStore         *CourseStore
 	Ticks               *engine.Engine
 	ColorConfig         *config.ColorsConfig
 	ConstantColorConfig *config.ColorsConfig
@@ -53,6 +54,7 @@ type Game struct {
 	Hub              *net.Hub
 	GlobalFlags      *GlobalFlagStore
 	Combat           *combat.Tracker
+	Casino           *casino.Manager
 	flagIndex        *flagTriggerIndex
 	queue            *CommandQueue
 	safespot         *SafespotManager
@@ -83,7 +85,7 @@ func New(dataDir string, colorConfig *config.ColorsConfig, constantColorConfig *
 			ObjectStore:         object.NewObjectStore(dataDir),
 			ItemStore:           item.NewItemStore(dataDir),
 			AccountStore:        player.NewAccountStore(dataDir),
-			MobStore:             world.NewMobStore(dataDir),
+			MobStore:            world.NewMobStore(dataDir),
 			CraftIndex:          NewCraftIndex(),
 			CourseStore:         NewCourseStore(dataDir),
 			Ticks:               engine.New(),
@@ -93,6 +95,7 @@ func New(dataDir string, colorConfig *config.ColorsConfig, constantColorConfig *
 		},
 		GlobalFlags:      NewGlobalFlagStore(),
 		Combat:           combat.NewTracker(),
+		Casino:           casino.NewManager(time.Now().UnixNano()),
 		flagIndex:        newFlagTriggerIndex(),
 		queue:            NewCommandQueue(),
 		safespot:         NewSafespotManager(),
@@ -131,6 +134,11 @@ func (g *Game) SetHub(hub *net.Hub) {
 			}
 		}
 	})
+	hub.OnDisconnect(func(sess *net.Session) {
+		if sess.Player != nil {
+			g.emitCasinoEvents(g.Casino.MarkDisconnected(sess.Player.Name))
+		}
+	})
 	g.GlobalFlags.OnChange(func(name string, value any) {
 		g.fireGlobalFlagTriggers(name, value)
 	})
@@ -339,8 +347,9 @@ func (g *Game) ProcessQueuedCommands() {
 		ss, _ := g.safespot.Get(p.Name)
 		isHiding := ss.Active
 		isBusy := p.Action != nil || len(p.WalkSequence) > 0 || g.Combat.Get(p.Name) != nil || p.MoveTicks > 0 || isHiding
+		isCasinoSpin := g.Casino != nil && g.Casino.MachineBusy(p.Name)
 		_, isResting := g.restTimers[p.Name]
-		if !isResting && !isBusy && qc.Session.State == net.StateGame {
+		if !isResting && !isBusy && !isCasinoSpin && qc.Session.State == net.StateGame {
 			g.writePrompt(qc.Session)
 		}
 	}
diff --git a/internal/game/look_entities.go b/internal/game/look_entities.go
index dd2cdf0..4ed47c9 100644
--- a/internal/game/look_entities.go
+++ b/internal/game/look_entities.go
@@ -5,6 +5,7 @@ import (
 	"sort"
 	"strings"
 
+	"thehouseoficarus/internal/casino"
 	"thehouseoficarus/internal/color"
 	"thehouseoficarus/internal/net"
 	"thehouseoficarus/internal/player"
@@ -73,7 +74,7 @@ func (g *Game) showRoomMobs(sess *net.Session, p *player.Player, room *world.Roo
 func (g *Game) showRoomObjects(sess *net.Session, p *player.Player, room *world.Room) []string {
 	objs := g.World.AllObjInstances(p.RoomID)
 	if len(objs) == 0 {
-		return g.showFarmPatches(sess, p)
+		return appendRoomCasinos(g.showFarmPatches(sess, p), g.showRoomCasinos(sess, room))
 	}
 	var lines []string
 	lines = append(lines, "")
@@ -220,9 +221,43 @@ func (g *Game) showRoomObjects(sess *net.Session, p *player.Player, room *world.
 	}
 
 	lines = append(lines, g.showFarmPatches(sess, p)...)
+	return appendRoomCasinos(lines, g.showRoomCasinos(sess, room))
+}
+
+func (g *Game) showRoomCasinos(sess *net.Session, room *world.Room) []string {
+	if room == nil || (len(room.CasinoTables) == 0 && len(room.CasinoMachines) == 0) {
+		return nil
+	}
+	var lines []string
+	for _, table := range room.CasinoTables {
+		name := casinoGameLabel(table.Game) + " table"
+		lines = append(lines, fmt.Sprintf("A %s is here.", g.colorize(sess, "casino_action", name)))
+	}
+	for _, machine := range room.CasinoMachines {
+		name := casinoGameLabel(machine.Game) + " machine"
+		lines = append(lines, fmt.Sprintf("A %s is here.", g.colorize(sess, "casino_action", name)))
+	}
 	return lines
 }
 
+func appendRoomCasinos(lines, casinos []string) []string {
+	if len(casinos) == 0 {
+		return lines
+	}
+	if len(lines) == 0 || lines[len(lines)-1] != "" {
+		lines = append(lines, "")
+	}
+	return append(lines, casinos...)
+}
+
+func casinoGameLabel(game casino.GameName) string {
+	label := strings.ReplaceAll(string(game), "_", " ")
+	if label == "" {
+		return "casino"
+	}
+	return label
+}
+
 func (g *Game) showGroundItems(sess *net.Session, p *player.Player, room *world.Room) []string {
 	ground := g.World.GroundItemsDetailed(p.RoomID)
 	if len(ground) == 0 {
diff --git a/internal/game/render_help.go b/internal/game/render_help.go
index 7b7efa2..8af3096 100644
--- a/internal/game/render_help.go
+++ b/internal/game/render_help.go
@@ -53,6 +53,10 @@ var commandList = []cmdEntry{
 	{"jack / jackin", "Active", "Jack into a terminal (Hacking)"},
 	{"look / l", "Instant", "Look around or examine things"},
 	{"map", "Instant", "Display an ASCII map of the area"},
+	{"play", "Active", "Join a casino game in the current room"},
+	{"bet", "Active", "Place a casino wager"},
+	{"autobet / autospin", "Active", "Automatically repeat a casino wager"},
+	{"spin", "Active", "Spin the current casino wager"},
 	{"mine", "Active", "Mine rocks (Mining)"},
 	{"mix", "Active", "Mix potions (Pharmacy)"},
 	{"mods / modlist", "Instant", "List available science modules"},
diff --git a/internal/game/tick_systems.go b/internal/game/tick_systems.go
index 4d8d4b6..b819454 100644
--- a/internal/game/tick_systems.go
+++ b/internal/game/tick_systems.go
@@ -27,6 +27,7 @@ func TickSystemOrder() []struct{ Name string } {
 
 var tickSystemOrder = []tickSystem{
 	{"ProcessQueuedCommands", (*Game).ProcessQueuedCommands},
+	{"CasinoTick", (*Game).CasinoTick},
 	{"MoveTick", (*Game).MoveTick},
 	{"SequenceTick", (*Game).SequenceTick},
 	{"TransientMobTick", (*Game).TransientMobTick},
@@ -57,4 +58,4 @@ func (g *Game) RunTickSystems() {
 	for _, s := range tickSystemOrder {
 		s.Run(g)
 	}
-}
\ No newline at end of file
+}
diff --git a/internal/game/tick_systems_test.go b/internal/game/tick_systems_test.go
index 6b44e91..2fa67ac 100644
--- a/internal/game/tick_systems_test.go
+++ b/internal/game/tick_systems_test.go
@@ -22,6 +22,7 @@ import (
 // contract.
 var expectedTickSystemOrder = []string{
 	"ProcessQueuedCommands",
+	"CasinoTick",
 	"MoveTick",
 	"SequenceTick",
 	"TransientMobTick",
@@ -144,4 +145,4 @@ func newRunTickSystemsTestGame() *Game {
 		hackingStates:    map[string]*hacking.Session{},
 		sequences:        map[string]*sequence{},
 	}
-}
\ No newline at end of file
+}
diff --git a/internal/net/server.go b/internal/net/server.go
index 9da90ea..da1c01b 100644
--- a/internal/net/server.go
+++ b/internal/net/server.go
@@ -100,10 +100,11 @@ type Server struct {
 }
 
 type Hub struct {
-	mu       sync.Mutex
-	sessions map[*Session]bool
-	rooms    map[int]map[*Session]bool
-	onRemove func(*Session)
+	mu           sync.Mutex
+	sessions     map[*Session]bool
+	rooms        map[int]map[*Session]bool
+	onRemove     func(*Session)
+	onDisconnect func(*Session)
 }
 
 func NewHub() *Hub {
@@ -119,6 +120,12 @@ func (h *Hub) OnRemove(cb func(*Session)) {
 	h.onRemove = cb
 }
 
+func (h *Hub) OnDisconnect(cb func(*Session)) {
+	h.mu.Lock()
+	defer h.mu.Unlock()
+	h.onDisconnect = cb
+}
+
 func (h *Hub) Add(s *Session) {
 	h.mu.Lock()
 	defer h.mu.Unlock()
@@ -128,13 +135,18 @@ func (h *Hub) Add(s *Session) {
 
 func (h *Hub) Remove(s *Session) {
 	h.mu.Lock()
-	defer h.mu.Unlock()
 	if s.Player != nil && s.State == StateGame && !s.Disconnecting {
 		s.Disconnecting = true
 		s.DisconnectTicks = 10
+		onDisconnect := h.onDisconnect
+		h.mu.Unlock()
+		if onDisconnect != nil {
+			onDisconnect(s)
+		}
 		return
 	}
 	h.hardRemoveLocked(s)
+	h.mu.Unlock()
 }
 
 func (h *Hub) HardRemove(s *Session) {
diff --git a/internal/world/room.go b/internal/world/room.go
index c46c363..f4390da 100644
--- a/internal/world/room.go
+++ b/internal/world/room.go
@@ -5,6 +5,7 @@ import (
 
 	"gopkg.in/yaml.v3"
 	"thehouseoficarus/internal/behavior"
+	"thehouseoficarus/internal/casino"
 	"thehouseoficarus/internal/object"
 )
 
@@ -84,18 +85,20 @@ type ExitDef struct {
 }
 
 type Room struct {
-	ID                 int                 `yaml:"id"`
-	Name               string              `yaml:"name"`
-	Color              string              `yaml:"color"`
-	Description        behavior.DescList   `yaml:"description"`
-	Exits              map[ExitDir]ExitDef `yaml:"exits"`
-	Objects            []RoomObject        `yaml:"objects"`
-	ItemSpawns         []SpawnDef          `yaml:"item_spawns"`
-	Mobs               []RoomMob           `yaml:"mobs"`
-	OnEnter            []behavior.Trigger  `yaml:"on_enter,omitempty"`
-	OnExit             []behavior.Trigger  `yaml:"on_exit,omitempty"`
-	Hazard             string              `yaml:"hazard"`
-	BlockTransport     bool                `yaml:"block_transport"`
+	ID             int                    `yaml:"id"`
+	Name           string                 `yaml:"name"`
+	Color          string                 `yaml:"color"`
+	Description    behavior.DescList      `yaml:"description"`
+	Exits          map[ExitDir]ExitDef    `yaml:"exits"`
+	Objects        []RoomObject           `yaml:"objects"`
+	ItemSpawns     []SpawnDef             `yaml:"item_spawns"`
+	Mobs           []RoomMob              `yaml:"mobs"`
+	OnEnter        []behavior.Trigger     `yaml:"on_enter,omitempty"`
+	OnExit         []behavior.Trigger     `yaml:"on_exit,omitempty"`
+	Hazard         string                 `yaml:"hazard"`
+	BlockTransport bool                   `yaml:"block_transport"`
+	CasinoTables   []casino.TableConfig   `yaml:"casino_tables,omitempty"`
+	CasinoMachines []casino.MachineConfig `yaml:"casino_machines,omitempty"`
 }
 
 type RoomMob struct {