diff --git a/world.gd b/world.gd
index 5275304..9e1cc3d 100644
--- a/world.gd
+++ b/world.gd
@@ -91,6 +91,7 @@ func update_generation_ui() -> void:
 # Conway Specific
 #
 func start_conway() -> void:
+	clear_world()
 	generate_world()
 
 	generation = 1
@@ -173,6 +174,15 @@ func toggle_pause() -> void:
 	else: generation_timer.start()
 
 
+## Loop over cell_ids and free the resource in the RenderingServer
+##   Clear cell_ids and cell_states
+func clear_world() -> void:
+	for row in cell_ids:
+		for id in row:
+			RenderingServer.free_rid(id)
+	cell_ids = []
+	cell_states = []
+
 ## Create the cell using the rendering server
 ##  This is only performed on initial world generation
 func create_cell(pos: Vector2, visible_cell: bool = true) -> RID:
@@ -237,3 +247,7 @@ func _on_start_paused_button_toggled(button_pressed: bool) -> void:
 
 func _on_world_seed_generate_pressed() -> void:
 	generation_seed.text = str(randi())
+
+
+func _exit_tree() -> void:
+	clear_world()