Sonic the Hedgehog protagonist Sonic the Hedgehog, a blue hedgehog able to run at supersonic speeds, and recurring villain Dr. Eggman, an evil scientist whose ambition is to conquer the world. Among Sonic's many allies, the most well-known include: Miles "Tails" Prower, a twin-tailed, highly intelligent yellow fox who is Sonic's sidekick and best friend; Amy Rose, a pink hedgehog who is Sonic's self-proclaimed girlfriend and a hero in her own right; Knuckles the Echidna, a coolheaded red echidna who is the guardian of the Master Emerald; Shadow the Hedgehog, an anti-heroic doppelgänger of Sonic with a dark past; and Metal Sonic, a
Sonic the Hedgehog 3 Sonic the Hedgehog 3 Development began shortly after the release of "Sonic 2" in late 1992. It was developed simultaneously with "Sonic & Knuckles"; they were developed as a single game until time constraints and cartridge costs forced the developers to split them in two projects. The "Sonic & Knuckles" cartridge features "lock-on" technology that allows it to be physically attached to the "Sonic 3" cartridge, creating a combined game, "Sonic 3 & Knuckles". Pop musician Michael Jackson composed portions of the soundtrack, but left the project and went uncredited. As with its predecessors, "Sonic 3" was a critical and