From Sonic Retro

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BBat is a badnik which could be found in Hidden Palace Zone, in a beta version of Sonic 2, until that level was ultimately scrapped. This badnik's code was deleted in Sonic the Hedgehog 2 (beta 5), along with Redz.

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.

The concept was later reused as Sonic 3's Batbot.

Sonic the Hedgehog 2 (16-bit)

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