The Tart Turtle (タータ＝タルトル) is the boss of Great Turquoise Zone, and the first in Sonic the Hedgehog Triple Trouble. As in Triple Trouble's predecessor, Sonic Chaos, Dr. Eggman has dispatched this larger Badnik to attack Sonic and Tails.
The Tart Turtle is a giant, levitating, robotic sea turtle. However, it posesses essentially no offensive capabilities at all, and simply flies back and forth from one side of the screen to the other. In the first (semi-submerged) section of the boss fight, Sonic or Tails simply have to jump up and smash it a few times. After five hits, the Tart Turtle ascends to the surface, and the heroes have to make use of the smaller spring-backed Springshells to catch up, then gain the necessary height to land a hit. Sonic Triple Trouble was unusual in enabling Sonic and Tails to perform a midair Spin Attack off Springs, which is precisely what the player has to do to defeat this first boss. After four more hits, the Tart Turtle will be destroyed.
After the boss, Sonic or Tails will run into Knuckles, who has (now for the second time) been tricked by Eggman into thinking Sonic and Tails have their own malign reasons for seeking the Chaos Emeralds. The echidna sets off a fiery tower trap which blasts the player all the way into Sunset Park Zone.