CHEMICAL PLANT ZONE
Without a doubt this is the fastest zone in the entire game. From the start you run along bending conduits very fast while the rest of the landscape just flies by. Mega speed is gained from fans sitting on these paths blasting you along a platform then down a loop then another and another going insanely fast!
As this is a plant there are plenty of industrial goings on around. There is a series of pipes throughout the level. Break the block onto and jump in. You'll be sent around at speed and will be able to select your route should you press a direction of the controller at the junction.
Some of Chemical Plant Zone is submerged therefore breathing rules apply once more. The water is purple suggesting a chemical tinge to it.
Not many enemies on this stage but some will catch you out. There are some bizarre chemical creations that pose a threat.
Robotnik has you between two rotating platforms. He sucks up the chemicals from the pool below you and tries to dump them on you. Best bet is to get him while he's filling up.