Stone of Agony

The Stone of Agony is an item in The Legend of Zelda: Ocarina of Time that makes the controller vibrate when Link is near a secret, such as a hidden grotto or Treasure Chest. It is obtained from one of the cursed Hylians in the House of Skulltula after Link has collected twenty Gold Skulltula Tokens. The Stone of Agony is modeled after a Nintendo 64 Rumble Pak.

As the Wii Virtual Console version of The Legend of Zelda: Ocarina of Time does not support rumble, the Stone of Agony is non-functional in this version.

The Stone of Agony is replaced with the Shard of Agony in The Legend of Zelda: Ocarina of Time 3D, which uses audio and visual cues instead of vibrations to indicate secrets, as the Nintendo 3DS lacks a rumble feature. While the Stone of Agony does not appear in The Legend of Zelda: Majora's Mask, its functionality is available by default.

Instruction booklet description
"The Stone of Agony is an item you may find in Hyrule. When you are near treasure chests or hidden items, if you have the Stone of Agony, your controller rumbles (only with the Rumble Pak accessory)."