feat: Implement tile scarcity model for tile generation and power-up inventory UI for player interaction.

scripts/managers/goals_cycle_manager.gd

@@ -19,6 +19,7 @@ var is_match_active: bool = false
 # Score tracking: peer_id -> score
 var player_scores: Dictionary = {}
 var player_goal_counts: Dictionary = {} # peer_id -> count
+var stop_n_go_winner_id: int = -1 # Track winner for Stop n Go sorting
 
 # Reference to main scene
 var main_scene: Node = null
@@ -299,8 +300,16 @@ func _update_leaderboard():
 	var sorted_scores = []
 	for peer_id in player_scores.keys():
 		sorted_scores.append({"peer_id": peer_id, "score": player_scores[peer_id]})
-	
-	sorted_scores.sort_custom(func(a, b): return a.score > b.score)
+	# Custom Sort for Stop n Go
+	if stop_n_go_winner_id != -1:
+		sorted_scores.sort_custom(func(a, b):
+			if a.peer_id == stop_n_go_winner_id: return true
+			if b.peer_id == stop_n_go_winner_id: return false
+			return a.score > b.score
+		)
+	else:
+		sorted_scores.sort_custom(func(a, b): return a.score > b.score)
+		
 	emit_signal("leaderboard_updated", sorted_scores)
 
 # =============================================================================
@@ -432,7 +441,17 @@ func get_leaderboard() -> Array:
 	var sorted_scores = []
 	for peer_id in player_scores.keys():
 		sorted_scores.append({"peer_id": peer_id, "score": player_scores[peer_id]})
-	sorted_scores.sort_custom(func(a, b): return a.score > b.score)
+	
+	# Custom Sort for Stop n Go
+	if stop_n_go_winner_id != -1:
+		sorted_scores.sort_custom(func(a, b):
+			if a.peer_id == stop_n_go_winner_id: return true
+			if b.peer_id == stop_n_go_winner_id: return false
+			return a.score > b.score
+		)
+	else:
+		sorted_scores.sort_custom(func(a, b): return a.score > b.score)
+		
 	return sorted_scores
 
 func get_time_remaining() -> float:

scripts/managers/player_input_manager.gd

@@ -89,14 +89,24 @@ func handle_unhandled_input(event):
 	# --- Keyboard Shortcuts (Event-based) ---
 	if event is InputEventKey and event.pressed and not event.echo:
 		match event.keycode:
-			KEY_KP_1, KEY_1:
-				player.activate_powerup(0) # FASTER_SPEED
-			KEY_KP_2, KEY_2:
-				player.activate_powerup(2) # BLOCK_FLOOR
-			KEY_KP_3, KEY_3:
-				player.activate_powerup(1) # AREA_FREEZE
-			KEY_KP_4, KEY_4:
-				player.activate_powerup(3) # INVISIBLE_MODE
+			KEY_KP_1, KEY_1, KEY_KP_2, KEY_2, KEY_KP_3, KEY_3, KEY_KP_4, KEY_4:
+				var is_sng = LobbyManager.game_mode == "Stop n Go"
+				match event.keycode:
+					KEY_KP_1, KEY_1:
+						player.activate_powerup(0) # FASTER_SPEED
+					KEY_KP_2, KEY_2:
+						if is_sng:
+							player.activate_powerup(1) # AREA_FREEZE (StopNGo)
+						else:
+							player.activate_powerup(2) # BLOCK_FLOOR (Free)
+					KEY_KP_3, KEY_3:
+						if is_sng:
+							player.activate_powerup(3) # INVISIBLE_MODE (StopNGo)
+						else:
+							player.activate_powerup(1) # AREA_FREEZE (Free)
+					KEY_KP_4, KEY_4:
+						if not is_sng:
+							player.activate_powerup(3) # INVISIBLE_MODE (Free)
 			# KEY_R:
 			# 	player.auto_put_item()
 			KEY_Q:

scripts/managers/special_tiles_manager.gd

@@ -461,8 +461,11 @@ func spawn_powerups_around(center: Vector2i, force_powerups: bool = true):
 				if rng.randf() < 0.7:
 					item_id = rng.randi_range(7, 10)
 				else:
-					# 30% Chance for PowerUp (11-14)
-					item_id = rng.randi_range(11, 14)
+					# 30% Chance for PowerUp (Exclude Wall 13 only in Stop n Go)
+					if LobbyManager.game_mode == "Stop n Go":
+						item_id = [11, 12, 14].pick_random()
+					else:
+						item_id = rng.randi_range(11, 14)
 				
 				var cell = Vector3i(pos.x, 1, pos.y)
 				

scripts/managers/touch_controls.gd

@@ -245,11 +245,13 @@ func _ensure_shortcut_label(btn: Button, button_name: String):
 	if btn.has_node("ShortcutLabel"):
 		# Update Label content if it exists to match potential remapping
 		var existing_lbl = btn.get_node("ShortcutLabel")
+		var is_sng = LobbyManager.game_mode == "Stop n Go"
+		
 		match button_name:
-			"Grab": existing_lbl.text = "Space"
+			"Grab": existing_lbl.text = "Space" if is_sng else ""
 			"Put": existing_lbl.text = "" 
-			"AttackMode": existing_lbl.text = "Q"
-			"SpawnBoost": existing_lbl.text = "E"
+			"AttackMode": existing_lbl.text = "Q" if is_sng else ""
+			"SpawnBoost": existing_lbl.text = "E" if is_sng else ""
 		return
 		
 	# Add Keyboard Shortcut Label