Sky Base Zone boss

The Sky Base Zone boss is a boss room that appears in the Sega Master System and Sega Game Gear version of Sonic the Hedgehog. It was a booby-trapped room created by Dr. Robotnik that the doctor used to battle Sonic the Hedgehog.

The Sky Base Zone boss is a room whom Robotnik have control of. It consists of a bolted cyan (or gray in the Game Gear version) elevation with yellow and black hazard stripes on its center and a red switch on top of it. A cylindrical protective transparent glass covers the top of the elevation. Depending on the version if the game, the weaponry used by the boss is different. On the Master System version it possesses two blue and gray spheres, one on the ceiling and the other under the floor, that can generate electric columns between them. It also has an orange energy ball generator on top of the protective glass. Meanwhile, the Game Gear version of the boss disposes of gray flamethrowers on the floor instead of electric spheres and the orange energy ball generator is on the center of the ceiling instead.

Sonic the Hedgehog (8-bit)
In the 8-bit version of Sonic the Hedgehog, Dr. Robotnik used this installation to attack Sonic underwater when he arrived at the end of Sky Base Zone. In spite of Robotnik's efforts though, his installation got destroyed by Sonic in the end. Robotnik managed to temporarily flee afterward using a teleporter nearby, only to be followed and later caught by Sonic as he continued fleeing on his Egg Mobile in Green Hill Zone.

Battle
The Sky Base Zone boss is the final boss of Sonic the Hedgehog. The player fights it at the end of Sky Base Zone Act 3.

Boss guide
After dropping in Sky Base Zone Act 3, the player will have to run down a slope until reaching the boss arena wich the boss fully occupies. The camera will then moves to reveal the entire room, including Robotnik, initiating the boss battle.

In the Master System's version, the boss will start with the electric spheres moving to the right side of the arena before generating an electric column between them. They will then move leftward all the way to the left edge of the boss arena before turning off and returning to the right side of the arena.

Once Robotnik has taken twelve hits, he will be defeated and must be chased after until he reaches a teleporter nearby and teleport himself away. Sonic will then also use the teleporter to drop on a fleeing Robotnik, destroying his Egg Mobile and stopping the Doctor's plans. The Zone and the game will then end as the final score is calculated.