Egg Wheel is the boss of Sunset Hill in Sonic Advance 3, piloted by Doctor Eggman.
Appearance
As the name replies, Egg Wheel is a giant wheel. It is mostly gray with some black and yellow stripes on each of the sides. Both an Egg Mobile and Gemerl are located by each other in what you may consider the top of Egg Wheel.
Battle
Dr. Eggman will attack the player by rolling left and right. When in sight, the player can hit the cockpit to damage the mech. A button in the middle of the stage will make a platform appear to dodge the wheel. After six hits, the machine will explode and Eggman will fly away with a damaged Gemerl.