class_name ClosedDoor extends Door func _is_key(_node: Node) -> bool: return false func _can_open(body: Node2D) -> bool: if not body.has_node("Pickups"): return false if not body.has_method("remove_pickup"): return false for pickup in body.get_node("Pickups").get_children(): if _is_key(pickup): body.remove_pickup(pickup) return true return false