Batbot (Hidden Palace Zone)

"BBat" is an unnamed badnik which was intended be found in the Sonic the Hedgehog 2 version of Hidden Palace Zone, but it remained unused when the zone was ultimately scrapped.

Description
It waits for Sonic to get closer, and then it attacks by simply following an U-shaped pattern, ideally hitting Sonic at the lowest point of the arc.

Trivia

 * The concept was later reused as Batbot in Sonic the Hedgehog 3.