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Tails, standing next to a KeroKero.

Kero-Kero (ケロケロ Kerokero?) is an enemy that appears in Sonic Advance. It is a model of Badniks created by Dr. Eggman which can be found in Neo Green Hill Zone.


Kero-Kero makes small jumps towards the player and they can be seen croaking occasionally. This badnik doesn't attack the player in any way, but if touched, the player will lose Rings. To defeat Kero-Kero, the player must either jump on top of it, or spin dash into it.


  • Its name comes from "Kero", a Japanese onomatopoeia for the croaking of a frog.

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