diff --git a/sandbox_probe/probe.gd b/sandbox_probe/probe.gd
index e9955cd..73ebb3d 100644
--- a/sandbox_probe/probe.gd
+++ b/sandbox_probe/probe.gd
@@ -1,6 +1,6 @@
-extends SceneTree
+extends Node
 
-func _init():
+func _ready():
 	print("=== SANDBOX PROBE START ===")
 	probe_script_loading()
 	probe_os_apis()
@@ -8,7 +8,7 @@ func _init():
 	probe_network()
 	probe_engine_apis()
 	print("=== SANDBOX PROBE END ===")
-	quit()
+	get_tree().quit()
 
 func probe_script_loading():
 	print("--- Script loading ---")
diff --git a/sandbox_probe/probe.tscn b/sandbox_probe/probe.tscn
index c9a51ef..236e56a 100644
--- a/sandbox_probe/probe.tscn
+++ b/sandbox_probe/probe.tscn
@@ -2,5 +2,5 @@
 
 [ext_resource type="Script" path="res://probe.gd" id="1"]
 
-[node name="Probe" type="SceneTree"]
+[node name="Probe" type="Node"]
 script = ExtResource("1")
diff --git a/sandbox_probe/project.godot b/sandbox_probe/project.godot
index df42527..0a5efb3 100644
--- a/sandbox_probe/project.godot
+++ b/sandbox_probe/project.godot
@@ -4,5 +4,5 @@ config_version=5
 [application]
 
 config/name="sandbox_probe"
-run/main_scene=""
+run/main_scene="res://probe.tscn"
 config/features=PackedStringArray("4.6")