Init

scenes/game/mainGame/main_game.gd

@@ -0,0 +1,11 @@
+extends Node2D
+
+
+# Called when the node enters the scene tree for the first time.
+func _ready() -> void:
+	pass # Replace with function body.
+	print()
+
+# Called every frame. 'delta' is the elapsed time since the previous frame.
+func _process(delta: float) -> void:
+	pass

scenes/game/mainGame/main_game.tscn

@@ -0,0 +1,6 @@
+[gd_scene load_steps=2 format=3 uid="uid://dgxw2n4ei2ahe"]
+
+[ext_resource type="Script" path="res://scenes/game/mainGame/main_game.gd" id="1_napbe"]
+
+[node name="mainGame" type="Node2D"]
+script = ExtResource("1_napbe")

scenes/main/main.tscn

@@ -0,0 +1,3 @@
+[gd_scene format=3 uid="uid://bwsbkfnkncfhp"]
+
+[node name="Main" type="Node"]