Genesis

The Sega Genesis (also Megadrive in Europe and Japan) was the first game system to. Unlike Sega's former game systems (the best known of which was the Master System), which were all adaptations of Microsoft's MSX standard, the Sega Genesis used its own standard.

The following Sonic-related games were made for the Genesis:
 * Sonic the Hedgehog
 * Sonic the Hedgehog 2
 * Sonic the Hedgehog 3
 * Sonic & Knuckles
 * Sonic 3D Blast
 * Sonic Spinball

The Genesis could also be expanded with the Sega CD (which could play, among other games, Sonic CD) or the 32X (which included Knuckles Chaotix in the lineup). A proposed 32-bit system, the Sega Neptune (which was a combination of the Sega CD, 32X, and Genesis in one cartridge, plus other features), would have had its own Sonic title (Sonic Xtreme) as its first title.