Tails, standing next to a KeroKero.
Kero-Kero ( ケロケロ Kerokero ) ? is an enemy that appears in  . It is a model of Sonic Advance Badniks created by Dr. Eggman which can be found in Neo Green Hill Zone. They have an upgraded version called Gekogeko in Sonic Advance 3.
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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