Add a debug-only level skip overlay so testing level 3 does not require beating levels 1 and 2

Registered as an autoload so every scene gets it for free. Top-right shows a row of buttons generated from the levels array (main, level2, level3) plus keyboard shortcuts 1/2/3, and it runs with PROCESS_MODE_ALWAYS at layer 30 so it still works while the tree is paused on a death or level-clear screen. Hidden in exported release builds, same rule as the debug flight.

project.godot

@@ -15,6 +15,10 @@ run/main_scene="res://scenes/main.tscn"
 config/features=PackedStringArray("4.7", "Forward Plus")
 config/icon="res://icon.svg"
 
+[autoload]
+
+LevelSkip="*res://scenes/level_skip.tscn"
+
 [display]
 
 window/size/viewport_width=468

scenes/level_skip.tscn

@@ -0,0 +1,29 @@
+[gd_scene load_steps=3 format=3]
+
+[ext_resource type="Script" path="res://scripts/level_skip.gd" id="1_skip"]
+
+[sub_resource type="SystemFont" id="SystemFont_cjk"]
+font_names = PackedStringArray("Microsoft YaHei UI", "Microsoft YaHei", "SimHei", "Noto Sans CJK SC", "sans-serif")
+
+[node name="LevelSkip" type="CanvasLayer"]
+process_mode = 3
+layer = 30
+script = ExtResource("1_skip")
+
+[node name="Buttons" type="HBoxContainer" parent="."]
+anchor_left = 1.0
+anchor_right = 1.0
+offset_left = -130.0
+offset_top = 6.0
+offset_right = -6.0
+offset_bottom = 32.0
+theme_override_constants/separation = 4
+
+[node name="Hint" type="Label" parent="Buttons"]
+theme_override_colors/font_color = Color(1, 1, 1, 0.85)
+theme_override_colors/font_outline_color = Color(0, 0, 0, 0.8)
+theme_override_constants/outline_size = 3
+theme_override_fonts/font = SubResource("SystemFont_cjk")
+theme_override_font_sizes/font_size = 11
+text = "跳关"
+vertical_alignment = 1

scripts/level_skip.gd

@@ -0,0 +1,59 @@
+extends CanvasLayer
+
+## 测试用跳关：右上角一排数字按钮，点一下直接跳到对应关卡；
+## 键盘上按 1 / 2 / 3 也一样。
+## 只在编辑器 / 调试版里显示，导出的正式版会自动隐藏（和飞行一个规矩）。
+
+@export var levels: Array[String] = [
+	"res://scenes/main.tscn",
+	"res://scenes/level2.tscn",
+	"res://scenes/level3.tscn",
+]
+## 强制在正式版里也显示（一般别开）
+@export var always_show: bool = false
+
+
+func _ready() -> void:
+	visible = always_show or OS.is_debug_build()
+	if not visible:
+		set_process_unhandled_input(false)
+		return
+
+	var box := get_node_or_null("Buttons")
+	if box == null:
+		return
+	var index := 1
+	for path in levels:
+		var btn := Button.new()
+		btn.text = str(index)
+		btn.custom_minimum_size = Vector2(24.0, 24.0)
+		btn.focus_mode = Control.FOCUS_NONE
+		btn.add_theme_font_size_override("font_size", 12)
+		btn.pressed.connect(jump_to.bind(path))
+		box.add_child(btn)
+		index += 1
+
+
+func _unhandled_input(event: InputEvent) -> void:
+	var key := event as InputEventKey
+	if key == null or not key.pressed or key.echo:
+		return
+	var n := 0
+	match key.physical_keycode:
+		KEY_1, KEY_KP_1:
+			n = 1
+		KEY_2, KEY_KP_2:
+			n = 2
+		KEY_3, KEY_KP_3:
+			n = 3
+		KEY_4, KEY_KP_4:
+			n = 4
+		KEY_5, KEY_KP_5:
+			n = 5
+	if n >= 1 and n <= levels.size():
+		jump_to(levels[n - 1])
+
+
+func jump_to(path: String) -> void:
+	get_tree().paused = false
+	get_tree().change_scene_to_file(path)