Sonic the Hedgehog different media including animation, comic books, and a Hollywood film. The first "Sonic" game, "Sonic the Hedgehog", is a platform game released in 1991. Players control the anthropomorphic blue hedgehog Sonic, who can run and jump at high speeds using springs, ramps, and loops. Sonic must stop Dr. Robotnik from taking over the world using the Chaos Emeralds. "Sonic the Hedgehog 2" (1992) increased the overall size and speed of the series' gameplay and was the second best-selling Genesis game. It introduced Sonic's sidekick and best friend, Miles "Tails" Prower, who followed Sonic throughout the game, and allowed a second
Sonic the Hedgehog 3 in the game's advertisements and was also released as a single, which charted in the UK at number 55. Sega planned to release a single cartridge version of "Sonic 3" and "Sonic & Knuckles", "Sonic the Hedgehog 3 Limited Edition", but it was cancelled for unknown reasons. A prototype ROM image of this version was leaked in 2008. The game is included in the compilations "Sonic Jam" (1997) for the Sega Saturn, "Sonic & Knuckles Collection" (1997) and "Sonic & Garfield Pack" (1999) for Microsoft Windows, "Sonic Mega Collection" (2002) for the GameCube, "Sonic Mega Collection Plus" (2004) for the