Amps are electrical monsters who originated in the game Super Mario 64. Amps are spherical in appearance with a metallic tone. They have a mischievous grin on their face. They emit sparks and shock Mario when they come into contact with him.
Amps usually circle around an area or object and cannot be defeated, making them a fearsome stage hazard. In Shifting Sand Land's pyramid, however, there were two "homing Amps" that seemed to materialize out of nowhere and followed Mario. They would even try to match his motions if he jumped. Once he left their territory, however, they would move straight onward until they disappeared. This Amp variant is very popular with hackers. They were replaced with regular Amps in Super Mario 64 DS.