a move called the "Super Peel-Out", originally in Sonic CD, that makes him move extra fast, while Tails is able to fly and can hover over traps and other obstacles. Sonic can collect a new power-up called the "Rocket Shoes", which grant him the ability to fly for a short period of time; Tails is unable to use this, and will simply be granted extra rings if he were to smash a monitor containing Rocket Shoes. If Sonic collects 100 rings in a level, he will be teleported to a special stage, which, if completed, will award him with a Chaos Emerald. There are multiple endings that are based on the amount of Chaos Emeralds collected. Development and release Sonic Chaos was developed by Japanese studio Aspect Co., being the third Sonic the Hedgehog game they produced, and published by Sega for the Master System and Game Gear. Chaos is largely based on the Master System version of Sonic the Hedgehog 2, and is thus considered a follow-up or successor to that game. Aspect used the experience it received for its work on previous Sonic games while designing Chaos to make it more expansive and faster than its predecessors, in addition to improving the quality of the visuals. For the same reason, they were also able to make the game run faster. Chaos is both the first portable Sonic game and the first to feature Tails as a separate playable character with his own unique abilities. Sonic Chaos was released for the Master System on October 25, 1993, and for the Game Gear on November 19 to coincide with the release of Sonic CD. In Japan, it was titled Sonic & Tails. Chaos is included as an extra in the GameCube version of Sonic Adventure DX: Director's Cut (2003) as one of the eleven unlockable Sonic Game Gear games, and in Sonic Mega Collection Plus (2005) for the PlayStation 2, Xbox, and PC. In 2009, it was digitally released for the Wii Virtual Console in North America. Sonic Chaos is also included in the blue-colored model of the Game Gear Micro in 2020, alongside Gunstar Heroes, Sylvan Tale and Baku Baku Animal. Reception and legacy In the United States, it was the top-selling Game Gear game in January 1994. Sonic Chaos initially received a positive response from publications. The four reviewers of Electronic Gaming Monthly commented that the Game Gear