Race through loops, corkscrew twists and hidden passageways. Ride moving platforms over pits filled with spikes. Spring high in the air over traps and terrain.
Grab those Rings and Items, and keep on the lookout for Robotnik's badniks!
— Description from the Master System manual.
Turquoise Hill Zone (ターコイズヒル Tākoizuhiru?, lit. "Turquoise Hill") is the first Zone of Sonic Chaos for the Master System and Game Gear. As with other stages in this game, Turquoise Hill consists of two standard Acts followed by a shorter, third Act which contains the Zone's boss. Turquoise Hill Zone precedes Gigalopolis Zone.
Very much in the style of Green Hill Zone as a tropical-paradise-themed opening level, Turquoise Hill Zone is filled with grassy plains, palm trees, checkered soil, and loop-the-loops. Indeed, given that the game takes place on South Island, Turquoise Hill could be mistaken for Green Hill's next-door-neighbor. What distinguishes Turquoise Hill from its greener counterpart is the profusion of springs all over the place: on rocks, hidden underground... and even on the back of Badniks, which makes the Boing-o-Bots impossible to smash from above. A Spin Dash will do the trick, though.
Turquoise Hill Zone's boss is a single, massive Boing-o-Bot called the Lady Bug Boss. However, it possesses essentially no offensive capabilities at all, and simply crawls from one side of the screen to the other on caterpillar tracks. The spring on its back prevents Sonic the Hedgehog or Tails from simply jumping on it until the robot explodes; however, like its smaller brethren, the Lady Bug Boss is quite defenseless against a Spin Dash.
- Elements of the music for this Zone was incorporated into the final boss theme of the game.