Catcher Eggman (キャッチャーエッグマン), located in Casino Night Zone, is rather hard to defeat compared to the first three bosses of Sonic 2. You find yourself inside a giant pinball machine, which is occupied by a rather ticked off Dr. Eggman flying a more high-tech hovercraft, which drops red bombs and has an electric force field under it (so you can't hit its underside). From time to time, if you are underneath Eggman's machine, he will reach down to hit you with his electric field. This boss is a frustrating one at first, but once you get the hang of it, it becomes relatively easy to beat. You must spin dash up the walls of the pinball machine, then hold left or right on the D-Pad, or press the jump button, to move yourself off of the walls and onto Eggman. Keep in mind that this is a tough boss to defeat, so don't give up if you die on your first try.
It is possible to hit him constantly from the top with the right trajectory and speed, killing this boss quickly.
This boss returns somewhat upgraded in Sonic 4.
||Compressed art offset
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|Sonic the Hedgehog 2
||Casino Night Zone Boss
||$87AAC (Nemesis Format, 133 Blocks)