Guided lasers guard the corridors of this Zone, and you have to move fast to outrun them. Dodge the robot bombs that drop from the pipes. Use the D-Button to guide your passage through networks of pipes, and grab all the Rings and Items you can.
Finally you'll meet with Robotnik himself, in an arena he has prepared especially for you...
— Description from the Master System manual.
Electric Egg Zone (エレクトリックエッグ Erekutorikkueggu?, lit. "Electric Egg") is the sixth and final Zone of Sonic Chaos for the Master System and Game Gear, coming after Aqua Planet Zone. In keeping with the other stages of this game, Electric Egg consists of two standard Acts followed by a shorter, third Act which contains the boss.
Electric Egg is a sprawling techno-fortress, and the Doctor's final base in the game. Automatic laser cannons, bottomless pits, and spikes aplenty await Sonic and Tails as they close in on Dr. Robotnik himself. The zone is crisscrossed by a network of winding vacuum tubes, reminiscent of Scrambled Egg Zone from the previous Master System / Game Gear adventure, Sonic the Hedgehog 2.
The first part of the boss is the Laser Walker, a kind of scaled-down AT-AT Walker which fires bouncing bolts of energy. These are actually quite difficult to dodge, as they persist for a considerable while, ricocheting all over the screen. Robotnik's mecha can take 16 hits before it explodes...
Sonic proceeds to chase the escaping (and surprisingly nimble) Robotnik across Electric Egg's metal plates. If Sonic has not collected the five available Chaos Emeralds from the game's Special Stages, Sonic will chase Robotnik but he will get away with the red Chaos Emerald. If he has been collecting the gems, Robotnik still escapes aboard a floating platform, but he drops the sixth red Emerald while doing so. Presumably, reuniting this Emerald with its counterparts stops South Island from sinking into the sea.