Many of the features in this level first debuted in Metropolis Zone from Sonic the Hedgehog 2. A unique effect in the very first, outdoor part of Act 1 is an interesting floodlight motif, later used in Sonic Advance 2's Ice Paradise Zone. At the end of act 2, Sonic battles Eggman in a pogo-like Egg Mobile. It will bounce around trying to hit you until it is almost defeated. Then it will jump off screen and will land were ever you are. If you do dodge it you must also jump to avoid taking damage from the shaking ground. It will then bounce around again and off screen every once in a while until defeated.