Tunnelbot

Tunnelbot
Tunnelbot (Gakin in Japan) is Marble Garden Zone's sub-boss in Sonic the Hedgehog 3 for the Sega Mega Drive. Its appearance is a long bot with two drills on top to dig through the ruins of Marble Gardens fortresses.

Attack Pattern
Once the player reaches Tunnelbot, it will immediately burrow into the ceiling. Then, rocks will fall, and so will Tunnelbot, trying to injure the player. This is the chance to attack Tunnelbot. In Knuckles version of this sub-boss, A spiked pillar will rise from the ground to help Knuckles reach Tunnelbot, because Tunnelbot won't attempt to strike the ground.

Sonic the Comic
In the British Publication of Sonic the Comic, Tunnelbot was trying to keep Sonic away, but was defeated quickly.