In the Master System version, Sonic has to wait for Robotnik to descend before he can attack. Green Hill Zone: An unmodified Egg Mobile hovers above Sonic's head and occasionally comes down to Sonic's level to ram him.Once again, there is no boss fight in the Scrap Brain Zone. Robotnik in attack vehicles (often, but not always, Egg Mobiles), except for the last Zone in which Robotnik is once again in a large machine. In the 8-bit version of the original Sonic the Hedgehog, boss battles take place in dedicated third Acts that do not contain Rings or any other enemies. After the pistons, a group of electric sparks fall from the ceiling, which Sonic must avoid at all costs (he's got no Rings in this stage). When two of the pistons attempt to crush Sonic, he must quickly find the one holding Robotnik and attack him (assuming the other piston isn't blocking the way). Final Zone: Egg Crusher - A single room with four crushing pistons.

Sonic can either use the seesaws to bounce the bombs back into Robotnik, or use them to catapult himself into Robotnik when they land. Star Light Zone: Egg Spiker - The Egg Mobile drops spiked bombs onto a trio of seesaws below him.Labyrinth Zone: Labyrinth Zone boss - Robotnik will retreat from the flooding Labyrinth Zone in a climbing maze with spikes and fire traps.Robotnik uses the spike to attack Sonic, and can also destroy blocks that make up the floor of the boss arena. Spring Yard Zone: Egg Stinger - The Egg Mobile has a spike on its underside.The flames will set any platform it hits on fire. Marble Zone: Egg Scorcher - The Egg Mobile drops flames from a chute on its underside.Green Hill Zone: Egg Mobile-H - The Egg Mobile hovers at the top of the screen, swinging a wrecking ball back and forth.Robotnik in a machine and takes place in its own Zone, the Final Zone. However, the Scrap Brain Zone does not have its own boss and the game's final boss features Dr. Each boss features an Egg Mobile customized with a different weapon. Robotnik piloting versions of his Egg Mobile, and take place at the end of the third Act of each Zone. In the original Sonic the Hedgehog game from 1991, all of the bosses (except the last) feature Dr. 33 Sonic Chronicles: The Dark Brotherhood.

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