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Amps (also called Zaps) are small, electrified metal orbs that first appeared in Super Mario 64, later appearing as semi-common enemies on the Mario franchise. The resemble Bob-ombs, though they have a smile as well. Mario can get damages simply by touching one, which will shock him and stun him for a short time. Some Amps are stationary, while others move in a set path. They are immune to any and all attacks save for Invincible Mario, so they must often be avoided at all costs.
Larger Amps, called Big Amps, also appear, making their debut in New Super Mario Bros. U. They behave identical to regular Amps, but their larger size makes them more difficult to avoid.
In this game, Amps can be defeated if the player uses the Thunder Flower or a Rainbow Star. Using the Thunder Flower, the player can both absorve their electricity and kick them to defeat them and throw thunder balls, overloading the enemy with lots of electricity (in case, 2 thunderballs) and making it explode. In this game, it's revealed that the Amps are ruled by an giant Amp with a crown: King-Amp. He appears in a secret planet of Atomic Clock Galaxy (World 5) that can be only found if you feed the Hungry Luma with 50 coins. To defeat him, you will need to use the Thunder Flower.