Recorder

The Whistle, also known as the Recorder or the Magic Whistle, is an item that appears in The Legend of Zelda. The Whistle is located on the basement floor of the Lizard labyrinth, or Level-2 during the Second Quest.

From the overworld, Link can use the Whistle to summon a whirlwind, which warps him to the entrance of a completed labyrinth. If Link plays the Whistle while facing north or east, he is taken to the next completed labyrinth in order. If Link blows the Whistle while facing west or south, he is taken to the previous labyrinth in order. Link cannot warp to unfinished labyrinths, even if they are completed out of order. Even during the Second Quest, Link warps to where the labyrinths were found during the original quest.

The Whistle can reveal hidden areas on the overworld. In a certain screen, Link must play the Whistle to reveal a hidden entrance to the Demon labyrinth. For the Second Quest, the Whistle can reveal the hidden entrance into Level-6 and hidden caves. If Link was cursed by a Bubble, he can play the Whistle to remove it instantly. The Whistle is required during the boss battle against Digdogger, causing it to split into three smaller versions of itself.

The Legend of Zelda

 * Manual bio (page 24): "A really mysterious, magical item. Use it and it'll amaze you with what it can do."

Trivia

 * The Whistle and the theme for playing it is also in Super Mario Bros. 3, where it is named the Magic Whistle. If Mario or Luigi play it, a whirlwind takes them to the Warp Zone, where they can warp to a later world.
 * In The Legend of Zelda: The Minish Cap, the same theme plays when Link uses the Ocarina of Wind.