Kero-Kero (ケロケロ Kerokero?)[1] is an enemy that appears in Sonic Advance. It is a mass-produced, frog-based Badnik model created by Dr. Eggman.



Kero-Keros are based on frogs.


Tails, standing next to a Kero-Kero.

The Kero-Keros appear exclusively in Neo Green Hill Zone. In gameplay, Kero-Keros make small jumps toward the player and they can be seen croaking occasionally. This Badnik is relatively harmless and the only real danger they pose is running into them. To defeat a Kero-Kero, the player must either Spin 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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