Tri Drill

Tri Drill is a badnik that was originally going to appear in the cancelled video game, Sonic X-treme. It is the most common badnik in that game as it appears in many test levels and magazine screenshots. It has two types: one doesn't move, a second type moves to left and immediately turns right and vice versa, and in its finalized sprite, it seen that it's able to spin to attack Sonic.

Trivia

 * It appears that Tri Drill is the very first original enemy created for Sonic X-treme, as seen in a video of Sonic Mars.