- You may be looking for Drill Eggman II, the boss of the Mystic Cave Zone, or the Drill Mobile from the Marble Garden Zone.
Drill Eggman (ドリルエッグマン?) is the first boss encountered in Sonic the Hedgehog 2 for the Sega Mega Drive. It is a large car with a spinning drill attached to the front and appears at the end of the second act of the Emerald Hill Zone.
As the name implies, Drill Eggman is a red vehicle with a drill at its front, though it mostly comprises a gray Eggmobile. The front of the vehicle is similar in appearance to a mole.
At the beginning of the boss fight, Doctor Robotnik arrives in his Eggmobile (which unusually flies by means of helicopter-style rotor blades), which attaches to the drill vehicle. Robotnik then proceeds to drive the drill car back and forth across the screen.
Robotnik is vulnerable to a simple Spin Attack on his head. After being hit seven times, he laughs and shoots the drill-bit straight off the car. One final hit is required to destroy the machine, after which the scientist detaches his Eggmobile from the vehicle and flies away. The player can then open the Zone's Egg Capsule and complete the level.
In Sonic Advance, Eggman's Drill machine reappears in the X Zone, after the fight with his Wrecking ball machine. The fight is almost the same as it was in Sonic 2, except it takes less hits to defeat him.