Gene Gadget Zone

Apparantly right outside Volcano Valley Zone, Gene Gadget Zone is exactly what it says. Basically, a fraction of Eggman's base. With three acts and one being a boss, this isn't actually a tough place to traverse. Gene Gadget Zone consists of large transport tubes and industrial fans that turn on conveniently as soon as Sonic steps on them. Electrified floors are also a problem here, but can be avoided with the Electric Barrier, which is less abundent than the Flame Barrier in Volcano Valley Zone.

In all honesty, this place isn't hard. The one thing in this area that is remotely tricky is the very steep slopes and the moving platforms that shift back and forth constantly. If you fall, you have to start again. There are also platforms that move up and down upon Sonic stepping on them, but watch the shadow if you fall off. If you stand underneath it as it comes down, expect death.

Boss
Eggman must really be desperate as he floats his Egg-O-Matic right above a conveyer belt and lets pattern-placed mines do his dirty work. Avoid the mines at all costs, and don't think about waiting at the end of the belt for safety: there's spikes back there. When the fat man decides to be stupid and float closer to the belt, jump on him.