Blue Sphere (Game)

Blue Sphere (ブルースフィア) is a 1994 video game created by Sega and Sonic Team, which is the result of attaching Sonic the Hedgehog to the Sonic & Knuckles Mega Drive cartridge.
Attaching any cartridge other than Sonic the Hedgehog, Sonic the Hedgehog 2 or Sonic the Hedgehog 3 will instead provide the player with a single Special Stage, generated from the cart's ROM header. Some carts with large file sizes will instead load Sonic & Knuckles normally, as will attaching Sonic & Knuckles to itself.
The game can be accessed in Sonic & Knuckles Collection by selecting it (labelled Special Stage Mode) from the file menu. It also appears in the compilations Sonic Mega Collection and Sonic Mega Collection Plus, where it can be unlocked by playing Sonic the Hedgehog and Sonic 3D Blast 20 times each.
Category:Games
Category:Sonic the Hedgehog Games
Category:Sega Games
Category:1994 Games
Category:Platformers