Azure Lake

Azure Lake
First Two-player Zone, Sonic the Hedgehog 3

Azure Lake Zone is a two-player level in Sonic the Hedgehog 3. It's a small ruins-themed level that's overgrown with plant life, and the only real obstacles are a button that blockades your opponent (or slows you down if you run into it) and a segment that requires you to backtrack a bit to proceed if your opponent hit the aforementioned button. There is also a mud pit which is easy to avoid.

The level is somewhat reminiscent of Aquatic Ruin Zone from Sonic the Hedgehog 2.