Gakin

From Sonic Retro

Gakin (ガキーン), which you confront at the end of Marble Garden Zone Act 1, is one of the easiest sub-bosses in the game. Just like Sonic 2's Drill Eggman II, this boss burrows through the ceiling and back. Hit it whenever you can. With Knuckles, there is a rotating spiked platform that you can stand on to compensate for Knuckles' lower jump height.

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