Magic Mirror

The Magic Mirror is an item given to Link in A Link to the Past when he travels to Death Mountain. He acquires the mirror by helping the lost Old Man find his way to the safe house on the mountain. Link is able to use this magical mirror to travel from the Dark World back to the Light World. Once returned to the Light World, he can go back to the Dark World by touching the sparkling "X" point that appears where he returned to the Light World. This "X" can also be located by using the map. The mirror is essential to getting to the Tower of Hera, the third dungeon in A Link to the Past.

One more function of the Magic Mirror is that it can warp Link back to the beginning of any dungeon if he uses it while inside. This is comparable to the the function on Manbo's Mambo in Link's Awakening.

Four Swords Adventures
In Four Swords Adventures, there is a mirror known as the Dark Mirror which draws out the evil in the hearts of people.

The mirror was stolen by Ganon, who used it to create the numerous Shadow Links and spread evil across Hyrule. In addition to the mirror's evil powers, it was used to seal a dark tribe, much like the Mirror of Twilight found in Twilight Princess.

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