Eggwalker

The Egg Walker is a vehicle used by Doctor Eggman as his primary transportation in Sonic Adventure 2. It resembles Eggman's Eggmobile with two legs added. It is armed with a Volkan Cannon that can shoot regular ammo, a missile launcher, lock-on capabilities, and punching glove. Upon finding certain items, the standard Volkan Cannon becomes a Bazooka, capable of destroying steel crates, the standard lock-on missile becomes a Laser Blaster, capable of "splash damage", and a Jet Booster, giving it the ability to hover in mid-air. The player uses this when playing as Eggman, and fights against it twice when playing as Tails. It is not to be confused with the other Egg Walker from Sonic Adventure.

In 2-Player Mode and the second battle for Tails, it's also equipped with a rocket launcher and a laser cannon.