Egg Hammer 3

The first boss of Sonic Advance 3, this boss continues the Advance Series theme of a hammer styled boss to begin the game (as such, it is often affectionately referred to as the "Egg Hammer Tank III, despite not having an actual name). The boss is stationary, the hammer (and Eggman's cockpit) moves downwards left or right, stretching to hit where the player is standing as it does so. The attack is easily avoided and defeated in the standard eight hits. Also of note is that Gemerl, harmless and stationed in the base, follows the player to whichever side of the screen they are on.