feat: Implement the main game scene and the stop_n_go_manager script.

scenes/main.tscn

@@ -15,6 +15,7 @@
 [ext_resource type="Texture2D" uid="uid://dasaeaytvhll0" path="res://assets/models/pboard/AdjacentRect.tres" id="9_aspsw"]
 [ext_resource type="FontFile" uid="uid://xnjx058n4tsw" path="res://assets/fonts/Nougat-ExtraBlack.ttf" id="13_j8jky"]
 [ext_resource type="Theme" uid="uid://0dhxl4ohyxh8" path="res://assets/graphics/game_setting/setting_theme.tres" id="18_pm3ni"]
+[ext_resource type="PackedScene" uid="uid://dqp3e6q3orers" path="res://scenes/arena/stop_n_go.scn" id="24_y6deb"]
 [ext_resource type="Texture2D" uid="uid://ba80xnybpixw2" path="res://assets/graphics/touch_control/take_tile.png" id="25_qkpxi"]
 [ext_resource type="Texture2D" uid="uid://bsgqrjx2ity4c" path="res://assets/graphics/touch_control/speed.png" id="26_2f3dj"]
 [ext_resource type="Texture2D" uid="uid://pwxo4lb87yi" path="res://assets/graphics/touch_control/put_tile.png" id="26_5q0nq"]
@@ -1730,6 +1731,8 @@ custom_minimum_size = Vector2(0, 40)
 layout_mode = 2
 text = "Back"
 
+[node name="StopNGo" parent="." unique_id=1986641660 instance=ExtResource("24_y6deb")]
+
 [connection signal="text_submitted" from="MessageInput" to="." method="_on_message_input_text_submitted"]
 [connection signal="pressed" from="PauseMenu/Panel/VBox/ResumeBtn" to="." method="_on_resume_pressed"]
 [connection signal="pressed" from="PauseMenu/Panel/VBox/HowToPlayBtn" to="." method="_on_how_to_play_pressed"]

scripts/managers/stop_n_go_manager.gd

@@ -42,6 +42,7 @@ const TILE_FINISH = 3 # Finish Line
 const TILE_SAFE = 2 # Green Safe Zone
 const TILE_OBSTACLE = 4 # Wall
 const TILE_LIGHTNING_STONE = 15 # Ancient Rock with Lightning Symbol
+const TILE_SAFE_WALL = 16 # Safe Zone Wall
 
 var hud_layer: CanvasLayer
 var mission_label: Label
@@ -354,14 +355,117 @@ func _apply_arena_setup():
 			gridmap.set_cell_item(Vector3i(x, 0, z), tile_id)
 			gridmap.set_cell_item(Vector3i(x, 1, z), -1)
 			
-	# Dynamic Safe Zones are procedural and spawn during GO phase
+	# Create rooms (Option B: hollow inside, walls around edges)
-			
+	# Room 1: (7,6) to (11,9) - 5x4 Area. Boundaries: X[7..11], Z[6..9]
-	# Note: Specific obstacles removed as per user request to replace with random ones.
+	var r1_entrances = [Vector2i(7, 8), Vector2i(9, 6), Vector2i(9, 9), Vector2i(11, 8)]
-	# MISSION TILES: Moved to start_game_mode() to ensure they spawn AFTER walls.
+	_create_room_with_edge_walls(gridmap, 7, 6, 11, 9, r1_entrances)
 	
+	# Non-walkable obstacle inside Room 1
+	gridmap.set_cell_item(Vector3i(9, 1, 8), TILE_OBSTACLE)
+
+	# Room 2: (15,1) to (19,5) - 5x5 Area. Boundaries: X[15..19], Z[1..5]
+	var r2_entrances = [Vector2i(15, 2), Vector2i(17, 1), Vector2i(19, 2), Vector2i(18, 5)]
+	_create_room_with_edge_walls(gridmap, 15, 1, 19, 5, r2_entrances)
+
 	gridmap.update_grid_data()
 	gridmap.initialize_astar()
+
+func _create_room_with_edge_walls(gridmap: GridMap, x_start: int, z_start: int, x_end: int, z_end: int, entrances: Array):
+	for x in range(x_start, x_end + 1):
+		for z in range(z_start, z_end + 1):
+			var is_north = (z == z_start)
+			var is_south = (z == z_end)
+			var is_west = (x == x_start)
+			var is_east = (x == x_end)
+			
+			if is_north or is_south or is_west or is_east:
+				if not Vector2i(x, z) in entrances:
+					# We NO LONGER set TILE_OBSTACLE here so you can walk near the walls
+					# gridmap.set_cell_item(Vector3i(x, 1, z), TILE_OBSTACLE)
+					
+					# Determine placement SIDE and rotation
+					if is_north: _instantiate_safe_zone_wall(gridmap, x, z, "NORTH")
+					if is_south: _instantiate_safe_zone_wall(gridmap, x, z, "SOUTH")
+					if is_west: _instantiate_safe_zone_wall(gridmap, x, z, "WEST")
+					if is_east: _instantiate_safe_zone_wall(gridmap, x, z, "EAST")
+			
+			# Ensure ground is floor
+			var current_f0 = gridmap.get_cell_item(Vector3i(x, 0, z))
+			if current_f0 == -1: 
+				gridmap.set_cell_item(Vector3i(x, 0, z), TILE_WALKABLE)
+
+func _disconnect_astar_across_walls(gridmap: Node):
+	if not gridmap or not gridmap.get("astar"): return
+	var astar = gridmap.astar
 	
+	# We re-calculate the edges and disconnect
+	var rooms = [
+		{"start": Vector2i(7, 6), "end": Vector2i(11, 9), "entrances": [Vector2i(7, 8), Vector2i(9, 6), Vector2i(9, 10), Vector2i(11, 8)]},
+		{"start": Vector2i(15, 1), "end": Vector2i(19, 5), "entrances": [Vector2i(15, 2), Vector2i(17, 1), Vector2i(19, 2), Vector2i(18, 5)]}
+	]
+	
+	for room in rooms:
+		for x in range(room.start.x, room.end.x + 1):
+			for z in range(room.start.y, room.end.y + 1):
+				var pos = Vector2i(x, z)
+				var is_north = (z == room.start.y)
+				var is_south = (z == room.end.y)
+				var is_west = (x == room.start.x)
+				var is_east = (x == room.end.x)
+				
+				if is_north or is_south or is_west or is_east:
+					if pos in room.entrances: continue
+					
+					var current_id = gridmap.get_point_id(Vector3i(x, 0, z))
+					
+					if is_north:
+						var n_id = gridmap.get_point_id(Vector3i(x, 0, z - 1))
+						if astar.has_point(current_id) and astar.has_point(n_id):
+							astar.disconnect_points(current_id, n_id)
+					if is_south:
+						var s_id = gridmap.get_point_id(Vector3i(x, 0, z + 1))
+						if astar.has_point(current_id) and astar.has_point(s_id):
+							astar.disconnect_points(current_id, s_id)
+					if is_west:
+						var w_id = gridmap.get_point_id(Vector3i(x - 1, 0, z))
+						if astar.has_point(current_id) and astar.has_point(w_id):
+							astar.disconnect_points(current_id, w_id)
+					if is_east:
+						var e_id = gridmap.get_point_id(Vector3i(x + 1, 0, z))
+						if astar.has_point(current_id) and astar.has_point(e_id):
+							astar.disconnect_points(current_id, e_id)
+
+func _instantiate_safe_zone_wall(gridmap: GridMap, x: int, z: int, side: String):
+	var wall_scene = load("res://scenes/safe_zone_wall.tscn")
+	if not wall_scene: return
+	
+	var wall = wall_scene.instantiate()
+	gridmap.add_child(wall)
+	
+	var pos = Vector3(
+		x * gridmap.cell_size.x + gridmap.cell_size.x/2, 
+		0.5, 
+		z * gridmap.cell_size.z + gridmap.cell_size.z/2
+	)
+	
+	# Adjust position to the LINE between tiles based on side
+	match side:
+		"NORTH":
+			pos.z = z * gridmap.cell_size.z # Top edge of cell
+			wall.rotation_degrees.y = 0
+		"SOUTH":
+			pos.z = (z + 1) * gridmap.cell_size.z # Bottom edge
+			wall.rotation_degrees.y = 0
+		"WEST":
+			pos.x = x * gridmap.cell_size.x # Left edge
+			wall.rotation_degrees.y = 90
+		"EAST":
+			pos.x = (x + 1) * gridmap.cell_size.x # Right edge
+			wall.rotation_degrees.y = 90
+			
+	wall.add_to_group("SafeZoneWalls")
+	wall.global_position = pos
+		
 func setup_mission_tiles():
 	"""Public wrapper to trigger mission tile spawning before game start."""
 	if multiplayer.is_server():