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The Nintendo 64 Rumble Pak is a peripheral that attached to the back slot of the Nintendo 64 Controller. The idea of a vibrating controller would later become standard practice thanks to this contribution by Nintendo.
The device required two AAA batteries, was capable of vibrating softly, or shake violently. The Rumble Pak also shipped as a bundle with with Star Fox 64. In The Legend of Zelda: Ocarina of Time, the player can acquire an item called the Stone of Agony, which (if the player has a Rumble Pak) would vibrate if they were near a secret or hidden item. This item came in the appearance of a stone Rumble Pak.