Burrowbot

Drillin is a badnik that appears on the Game Gear version of the Sonic the Hedgehog 2 video game. It is essentially an upgraded model of Burrobot, a regular badnik that appeared in the Labyrinth Zone in the original Sonic the Hedgehog video game. It appears only in the Scrambled Egg Zone of Sonic the Hedgehog 2.

Attack Pattern
Drillin's attack pattern is identical to Burrobot's attack pattern: when at the right time, Drillin pops out from the ground when Sonic the Hedgehog is near to it. While the badniks are difficult to avoid, their drill-like-noses can be seen above prior to when they jump. This gives the player the chance to think again before getting hit by the Drillin. Only a Spin Dash or a Spin Jump can destroy these badniks.

Trivia

 * While although these badniks are based off of Burrobots, they have different designs, such as the "hat" Drillin has.