Add a level 2 scaffold and make the level-clear screen load the next level

level_clear.gd gained a next_level_scene export: empty reloads the current level, otherwise it changes to the given scene. Level 1 now points at res://scenes/level_2.tscn. level_2.tscn is an empty but complete level: background, three TileMapLayers wired to the same TileSet, player, HUD, death screen and level-clear screen, plus the empty prefab containers. Its hidden_passages script explicitly sets hidden_cells = [] so level 1's passage cells are not carved here.

scenes/level_2.tscn

@@ -0,0 +1,88 @@
+[gd_scene load_steps=9 format=3]
+
+[ext_resource type="Texture2D" path="res://assets/game/backgrounds/cloud_left.png" id="1_cloud1"]
+[ext_resource type="Texture2D" path="res://assets/game/backgrounds/cloud_trees.png" id="2_cloud2"]
+[ext_resource type="Texture2D" path="res://assets/game/backgrounds/cloud_hills.png" id="3_cloud3"]
+[ext_resource type="Texture2D" path="res://assets/game/backgrounds/cloud_right.png" id="4_cloud4"]
+[ext_resource type="TileSet" path="res://assets/game/tilesets/kenney_terrain_tileset.tres" id="5_tileset"]
+[ext_resource type="PackedScene" path="res://scenes/player.tscn" id="6_player"]
+[ext_resource type="PackedScene" path="res://scenes/hud.tscn" id="7_hud"]
+[ext_resource type="PackedScene" path="res://scenes/death_screen.tscn" id="8_death"]
+[ext_resource type="PackedScene" path="res://scenes/level_clear.tscn" id="9_clear"]
+[ext_resource type="Script" path="res://scripts/hidden_passages.gd" id="10_hidden"]
+
+[node name="Main" type="Node2D"]
+
+[node name="HUD" parent="." instance=ExtResource("7_hud")]
+
+[node name="DeathScreen" parent="." instance=ExtResource("8_death")]
+
+[node name="LevelClear" parent="." instance=ExtResource("9_clear")]
+
+[node name="Level" type="Node2D" parent="."]
+
+[node name="Background" type="Node2D" parent="Level"]
+
+[node name="SkyColor" type="Polygon2D" parent="Level/Background"]
+z_index = -30
+color = Color(0.8509804, 0.9411765, 0.9372549, 1)
+polygon = PackedVector2Array(0, 0, 468, 0, 468, 270, 0, 270)
+
+[node name="CloudBand_01" type="Sprite2D" parent="Level/Background"]
+z_index = -20
+texture_filter = 1
+position = Vector2(12, 150)
+texture = ExtResource("1_cloud1")
+
+[node name="CloudBand_02" type="Sprite2D" parent="Level/Background"]
+z_index = -20
+texture_filter = 1
+position = Vector2(36, 150)
+texture = ExtResource("2_cloud2")
+
+[node name="CloudBand_03" type="Sprite2D" parent="Level/Background"]
+z_index = -20
+texture_filter = 1
+position = Vector2(60, 150)
+texture = ExtResource("3_cloud3")
+
+[node name="CloudBand_04" type="Sprite2D" parent="Level/Background"]
+z_index = -20
+texture_filter = 1
+position = Vector2(84, 150)
+texture = ExtResource("4_cloud4")
+
+[node name="TerrainTileMaps" type="Node2D" parent="Level"]
+script = ExtResource("10_hidden")
+hidden_cells = []
+
+[node name="TerrainBase" type="TileMapLayer" parent="Level/TerrainTileMaps"]
+position = Vector2(9, 9)
+tile_set = ExtResource("5_tileset")
+
+[node name="TerrainDetailsA" type="TileMapLayer" parent="Level/TerrainTileMaps"]
+position = Vector2(9, 9)
+z_index = 1
+tile_set = ExtResource("5_tileset")
+
+[node name="TerrainDetailsB" type="TileMapLayer" parent="Level/TerrainTileMaps"]
+position = Vector2(9, 9)
+z_index = 2
+tile_set = ExtResource("5_tileset")
+
+[node name="ActorsAndCharacters" type="Node2D" parent="Level"]
+
+[node name="Player" parent="Level/ActorsAndCharacters" instance=ExtResource("6_player")]
+position = Vector2(102, 132)
+
+[node name="PrefabInstances" type="Node2D" parent="Level"]
+
+[node name="Structures" type="Node2D" parent="Level/PrefabInstances"]
+
+[node name="Hazards" type="Node2D" parent="Level/PrefabInstances"]
+
+[node name="Interactables" type="Node2D" parent="Level/PrefabInstances"]
+
+[node name="Collectibles" type="Node2D" parent="Level/PrefabInstances"]
+
+[node name="Signs" type="Node2D" parent="Level/PrefabInstances"]

scenes/main.tscn

@@ -25,6 +25,7 @@
 [node name="DeathScreen" parent="." unique_id=1952687359 instance=ExtResource("22_death")]
 
 [node name="LevelClear" parent="." instance=ExtResource("26_clear")]
+next_level_scene = "res://scenes/level_2.tscn"
 
 [node name="Level" type="Node2D" parent="." unique_id=1678372922]
 

scripts/diamond.gd.uid

@@ -0,0 +1 @@
+uid://dbjrrn5xe6nbh

scripts/door.gd.uid

@@ -0,0 +1 @@
+uid://dr3fyoan8fwhj

scripts/level_clear.gd

@@ -6,6 +6,9 @@ extends CanvasLayer
 
 @export var fade_time: float = 0.8
 @export var button_delay: float = 0.3
+## 点「进入下一关」时加载哪个场景。
+## 留空 = 重新加载本关；填 res://scenes/level_2.tscn 之类就跳到下一关。
+@export_file("*.tscn") var next_level_scene: String = ""
 
 var _fade: ColorRect = null
 var _center: CenterContainer = null
@@ -29,6 +32,8 @@ func _ready() -> void:
 		_fade.color = Color(0.0, 0.0, 0.0, 0.0)
 	if _center != null:
 		_center.visible = false
+	if next_level_scene.is_empty() and _button != null:
+		_button.text = "重新开始  (R)"
 
 
 func show_clear() -> void:
@@ -65,8 +70,9 @@ func _unhandled_input(event: InputEvent) -> void:
 			next_level()
 
 
-## 目前项目里只有一关，所以"下一关"先做成重新加载本关。
-## 以后真加了第二关，把这里换成 change_scene_to_file("res://scenes/level2.tscn") 即可。
 func next_level() -> void:
 	get_tree().paused = false
-	get_tree().reload_current_scene()
+	if next_level_scene.is_empty():
+		get_tree().reload_current_scene()
+	else:
+		get_tree().change_scene_to_file(next_level_scene)

scripts/level_clear.gd.uid

@@ -0,0 +1 @@
+uid://cxfohn44nkm28