This is the first zone and the easiest. The main dangers are spikes,
Buzzbombers, and other small enemies. Try and keep going fast, that
way you can avoid more dangers and get to higher up power ups. The Act
3 boss is Robotnik in his Egg-O-Matic with a checker wrecker ball
attached to the bottom. Get underneath the platforms when it swings
toward you and duck at the edge. It won't hit you. When it swings the
other way, jump on the platform and jump at Robotnik's ship. 8 such
hits will destroy his ship.
Green Hill Zone