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Sky Base Zone: A ceiling-mounted cannon that launches homing energy balls at Sonic.The fight takes place underwater, but Sonic can't drown in this stage. Labyrinth Zone: A submarine that shoots energy bullets from below Sonic and position-tracking torpedoes from above.Sonic has to dodge the cannon ball as it rolls back and forth, all without falling off the vine. Jungle Zone: Egg Mobile that drops exploding cannonballs on a ramped vine.The Game Gear version takes place on a ramped bridge instead and is much more difficult. The Master System version has the fight taking place on a single island, which Sonic can't fall from. Bridge Zone: A submarine that surfaces periodically to shoot a spread shot at Sonic.In the Game Gear version, the smaller screen makes it so Robotnik is always in attack range. 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: 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: Star Light Zone boss - 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: Spring Yard Zone boss - The Egg Mobile has a spike on its underside.The flames will set any platform it hits on fire. Marble Zone: Marble Zone boss - The Egg Mobile drops flames from a chute on its underside.
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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.