The Sonic 2 Beta, Aquatic Ruin Zone is known as Neo Green Hill Zone. It's also far from being complete.

There are no badniks in the level, which causes the hidden Grounder bots to simply not exist. Also the splash animation is incorrect, it shows up as sections of big bubbles.

The underwater section of he game is incomplete for the most part. Here Sonic should be able to go downwards to a lower section, but he'll instantly die.