Neo Green Hill Zone

The first zone of Sonic Advance 1. Set in a beach-like area, the zone is yet another of those tropical easy starting levels.

There is a bug in act 1, where you can go off-screen and straight through a solid wall (apparantly, only if playing as Knuckles) after running down the long slope.

The boss arena is on a long red suspension bridge, where for some reason, Robotnik is hovering and then runs off before you actually get to the boss. The boss itself is a tank with a large hammer on the end. Robotnik swings the hammer side to side, and on the last hit starts using it as a catapult.