4 files changed, 49 insertions, 2 deletions
diff --git a/data/help/casino.yaml b/data/help/casino.yaml
index fe81bad..74b1250 100644
--- a/data/help/casino.yaml
+++ b/data/help/casino.yaml
@@ -1,7 +1,7 @@
 name: casino
 aliases: [play, bet, rebet, table, watch, rules]
 category: Interaction
-related: [big6, roulette, racetrack, blackjack, baccarat, craps, slots, video poker, pai gow poker, plinko, pachinko, cash hunt, predictions, crypto]
+related: [big6, roulette, racetrack, blackjack, baccarat, craps, slots, video poker, pai gow poker, plinko, pachinko, cash hunt, coin flip, predictions, crypto]
 description: |
   Casino quick guide
 
@@ -55,6 +55,7 @@ description: |
   help plinko        Animated pyramid, four risk levels, up to ten balls.
   help pachinko      Rectangle of pins; populated board; pick a top slot; DOUBLE chains prizes.
   help cash hunt     Reveal 100 prizes, mix their positions, pick one square.
+  help coin flip     Fair 50/50 coin; red 0 to -100x, blue 0 to +100x; reserves 100x the stake.
   help video poker   Five cabinet types, selectable games, toggle holds and bonuses.
   help pai gow poker Seven cards, two hands; Classic, EZ, No Push and Fortune/Envy.
 
diff --git a/data/help/coin_flip.yaml b/data/help/coin_flip.yaml
new file mode 100644
index 0000000..56d9dd0
--- /dev/null
+++ b/data/help/coin_flip.yaml
@@ -0,0 +1,34 @@
+name: coin flip
+aliases: [coinflip, coin_flip, coin-flip, coin]
+category: Interaction
+related: [casino, cash hunt, pachinko]
+description: |
+  COIN FLIP — a fair 50/50 coin with two spinning faces.
+
+  play coin flip             Take the single seat.
+  bet 10                     Stake 10 (the house reserves 1000); the faces spin.
+  bet / rebet                Repeat your last stake.
+  stop                       Leave after the coin has landed.
+
+  Each round the RED face spins like a wheel and lands a negative multiplier
+  from 0 to -100. The BLUE face then spins and lands a positive multiplier
+  from 0 to +100, with a middle band (63-77 and 90) removed so the two faces
+  still average a -2 swing. The landed multipliers print, then the fair
+  50/50 coin flips. A settled coin is filled in solid red or blue.
+
+  The multiplier is a NET swing on your stake, so red -50 loses half your
+  stake, blue +50 wins half your stake, red -100 loses it all, and blue +100
+  doubles it. Multipliers include the stake; +0x is a push.
+
+  Because the swing can reach 100x your stake, the house requires you to
+  hold 100x your stake and reserves exactly that when you bet. Your payout
+  is (100 + swing) x stake, so it is never negative: a -100 red simply
+  returns zero. The reserve and the payout are one settled transaction.
+
+  The coin is exactly fair. The 2% house edge comes from the two faces:
+  red is uniform over 0..100 and blue drops a middle band to a mean of +46,
+  so the two distributions average a -2 swing per stake — exactly 98% RTP.
+
+  You cannot leave mid-round. Shutdown refunds an unsettled round; a failed
+  payout keeps your stake pending for recovery and settle retries the same
+  landed face.
diff --git a/data/rooms/casino/6202.yaml b/data/rooms/casino/6202.yaml
index 0ae636b..4a3ce45 100644
--- a/data/rooms/casino/6202.yaml
+++ b/data/rooms/casino/6202.yaml
@@ -1,8 +1,10 @@
 name: Fallen Star Pachinko Gallery
-description: A broad cabinet of polished obsidian frames a tall rectangle of silver pins. Numbered brass slots crown the top, a golden DOUBLE burns at the base, and jewel-bright prize lamps ring the pockets. Balls rain down in ribbons of light, bouncing pin to pin. The Kaleidoscope Vault glitters to the south.
+description: A broad cabinet of polished obsidian frames a tall rectangle of silver pins. Numbered brass slots crown the top, a golden DOUBLE burns at the base, and jewel-bright prize lamps ring the pockets. Balls rain down in ribbons of light, bouncing pin to pin. The Kaleidoscope Vault glitters to the south, and two turning coins glow to the north.
 exits:
   south:
     room: 6201
+  north:
+    room: 6203
 casino_tables:
   - id: pachinko
     game: pachinko
diff --git a/data/rooms/casino/6203.yaml b/data/rooms/casino/6203.yaml
new file mode 100644
index 0000000..4e73141
--- /dev/null
+++ b/data/rooms/casino/6203.yaml
@@ -0,0 +1,10 @@
+name: Two Moons Flip
+description: Two enormous coins hang from the ceiling, one veined in crimson and one washed in deep blue, turning slowly above a felt table. A brass rail reads, "One coin. One swing. The red takes, the blue gives." The Fallen Star Pachinko Gallery glitters to the south.
+exits:
+  south:
+    room: 6202
+casino_tables:
+  - id: coin_flip
+    game: coin_flip
+    min_bet: 1
+    max_bet: 10000