1 files changed, 68 insertions, 1 deletions

diff --git a/internal/game/map_test.go b/internal/game/map_test.go
index ebb2197..712202b 100644
--- a/internal/game/map_test.go
+++ b/internal/game/map_test.go
@@ -325,7 +325,23 @@ func TestBuildFullMap(t *testing.T) {
 
 func TestStripBlankRows(t *testing.T) {
 	input := []string{"  ", "hello", "", "  world  ", "   "}
-	want := []string{"hello", "  world  "}
+	want := []string{"hello", "", "  world  "}
+	got := stripBlankRows(input)
+	if len(got) != len(want) {
+		t.Fatalf("expected %d lines, got %d", len(want), len(got))
+	}
+	for i := range want {
+		if got[i] != want[i] {
+			t.Errorf("line %d: want %q, got %q", i, want[i], got[i])
+		}
+	}
+}
+
+func TestStripBlankRowsPreservesInternal(t *testing.T) {
+	// Internal blank rows (between non-blank content) should be preserved.
+	// They represent real vertical distance between disconnected components.
+	input := []string{"   ", "hello", "", "", "world", "   "}
+	want := []string{"hello", "", "", "world"}
 	got := stripBlankRows(input)
 	if len(got) != len(want) {
 		t.Fatalf("expected %d lines, got %d", len(want), len(got))
@@ -374,3 +390,54 @@ func TestLeftTrimCommonZero(t *testing.T) {
 		t.Errorf("line 1: want %q, got %q", "world", got[1])
 	}
 }
+
+func TestMap3DDisconnectedComponent(t *testing.T) {
+	// Tower 1 (0,0,0) has down→bridge (0,0,-1). bridge→east→tower2base (1,0,-1).
+	// tower2base→up→tower2 (1,0,0). Tower 2 is at the same z=0 as tower 1 but
+	// unreachable via horizontal exits. The 3D map should still show it.
+	dir := t.TempDir()
+	writeTempRoom(t, dir, 1, "name: Tower One\nexits:\n  down: 2\n")
+	writeTempRoom(t, dir, 2, "name: Bridge\nexits:\n  east: 3\n  up: 1\n")
+	writeTempRoom(t, dir, 3, "name: Tower Two Base\nexits:\n  up: 4\n  west: 2\n")
+	writeTempRoom(t, dir, 4, "name: Tower Two\nexits:\n  down: 3\n")
+
+	g := &Game{Deps: Deps{World: world.New(dir)}, Flags: NewFlagStore()}
+	mg := mapGlyphsForPlayer(false)
+
+	// Player has only visited tower 1. Tower 2 should appear but dimmed (unvisited).
+	sess := &net.Session{Player: &player.Player{
+		Stats: player.PlayerStats{RoomsVisited: map[int]bool{1: true}},
+		Flags: map[string]any{},
+	}}
+
+	out := strings.Join(buildTinyMap(g, sess, 1, mg), "\n")
+
+	// Tower 2 at (1,0,0) should appear on the same z-level map.
+	// Unvisited rooms render as □ (unicode) or o (ASCII).
+	if !strings.Contains(out, "□") && !strings.Contains(out, "o") {
+		t.Errorf("expected tower 2 (unvisited) to appear on the map:\n%s", out)
+	}
+}
+
+func TestMap3DDifferentZExcluded(t *testing.T) {
+	// Room 1 at (0,0,0) with up to room 2 at (0,0,1). Room 2 is at z=1,
+	// different from the player's z=0 level — should NOT show on the map.
+	dir := t.TempDir()
+	writeTempRoom(t, dir, 1, "name: Ground\nexits:\n  up: 2\n")
+	writeTempRoom(t, dir, 2, "name: Upper\nexits:\n  down: 1\n")
+
+	g := &Game{Deps: Deps{World: world.New(dir)}, Flags: NewFlagStore()}
+	mg := mapGlyphsForPlayer(false)
+	sess := &net.Session{Player: &player.Player{
+		Stats: player.PlayerStats{RoomsVisited: map[int]bool{1: true, 2: true}},
+		Flags: map[string]any{},
+	}}
+
+	out := strings.Join(buildTinyMap(g, sess, 1, mg), "\n")
+
+	// Room 2 is at a different z — it should NOT render as a room symbol.
+	// Unvisited rooms render as □ (unicode) or o (ASCII).
+	if strings.Contains(out, "□") || strings.Contains(out, " o ") {
+		t.Errorf("room at different z should not appear:\n%s", out)
+	}
+}