Sonic Chaos is a 1993 platform game published by Sega for the Master System and Game Gear. Players control Sonic the Hedgehog and his sidekick Miles "Tails" Prower in their quest to retrieve the Chaos Emeralds from Doctor Robotnik, who has stolen them to construct nuclear weapons. Gameplay involves running through stages, collecting rings, and defeating enemies. It is largely based on the Master System version of Sonic the Hedgehog 2, and is thus considered a follow-up to that game. Chaos is the first Sonic game for the Master System and Game Gear to feature Tails as a separate playable character with his own unique abilities. Developed by Japanese studio Aspect Co., Chaos is the first original Sonic game made for a handheld, instead of a port or remake of an existing game. Aspect used the knowledge gained from its work on previous Sonic games while designing Chaos to make it more expansive and faster than its predecessors. Chaos received a generally positive reception initially, with its levels and gameplay being praised; however, in retrospect it has gained a more average response for its unimpressive presentation and levels being of lackluster quality, alongside its slow framerate. A direct sequel, Sonic the Hedgehog: Triple Trouble, was released in 1994. Gameplay In Sonic Chaos, players control one of two characters—Sonic the Hedgehog or his sidekick Miles "Tails" Prower—and must complete each of the game's eight worlds in a quest to retrieve the Chaos Emeralds from the evil scientist Dr. Robotnik, who plots to use them to rule the world. Each world, referred to as "zones" in-game, is made up of three levels, called "acts", the third one consisting of a boss fight against one of Robotnik's henchbots, or Robotnik himself in the final zone. Levels are designed to allow the player to move as quickly as possible, and are largely based on those in its precursor Sonic the Hedgehog 2. The gameplay itself involves running through each level while collecting rings and defeating Robotnik's robotic minions; rings protect Sonic and Tails from being hit by an enemy or obstacle. Levels also contain small television monitors that can be smashed to reveal a power-up icon, which grant Sonic and Tails with unique abilities, such as speed shoes, a one-hit shield, and extra lives Chaos adds several new additions to the core Sonic gameplay. Both characters have their own unique characteristics; Sonic can perform