The Nintendo 64 is the system of choice for players who want to get "IN" on the most fun in video games.  The N64 Rumble Pak is the first ever home video-game controller accessory to create a physical sensation that complements the on-screen action. When connected to the Nintendo 64 Hand Controller, the Rumble Pak creates different degrees of vibrations, depending on the actions on-screen. You've got to feel it to believe it.