I think I'm stuck in the game "Zelda a Link to the Past". I decided to go inside the Ice Palace. To get into the Ice Palace you must use the mirror to go to the Light World. Then, you must move a rock to find a Magical Warp Tile that transfers you to the Dark World. You will be transferred inside the perimeter of the entrance of the Ice Palace.
So I did the beginning of the Ice Palace until I realized I don't have the Hookshot. The Hookshot is located in the Swamp Palace. When I leave the Ice Palace, I have no option but to use the mirror to go to the Light World, because I'm blocked by walls. But now that I've used my mirror to go to the Light World, how can I go back to Dark World?