In Sonic Jam, it can be accessed by "locking-on" Sonic 1 to Sonic & Knuckles. Locking on Sonic & Knuckles to another copy of Sonic & Knuckles will also load the game normally.īlue Sphere is also available in certain compilation games.
Cartridges with large ROM file sizes (those that exceed 2 MB usually Genesis games released after Sonic & Knuckles) will not load Blue Sphere, but will instead boot Sonic & Knuckles as normal. Most other cartridges will allow the player to access only a single stage of the game, based on the cartridge's ROM header and the stage's code in the full Blue Sphere game. If the cartridge that is locked on to Sonic & Knuckles is the original Sonic the Hedgehog (as well as Sonic Classics due to the placement of Sonic 1 being at the 2 MB mark that the lock-on technology reads, which is only exhibited on real hardware, and any ROMs that share the same header as Sonic 1, such as early prototypes of Sonic the Hedgehog 2), then the full game of Blue Sphere is accessed with all stages. When any other Sega Mega Drive cartidge is inserted, background characters with a blue tint aren't shown to have animation on the title screen and the code of single Blue Sphere stage is shown. The scrolling text will be replaced by "Get Blue Spheres!". When the original Sonic the Hedgehog is locked on to the Sonic & Knuckles special cartridge, a screen appears with the Sonic & Knuckles logo, models of the characters Sonic, Tails, Knuckles and Robotnik, and a line of scrolling text that says "No Way! No Way! No Way! No Way?" While this screen is visible, pressing, and at the same time changes the screen to the Blue Sphere menu. The title screen with single Blue Sphere stage code, from Sonic & Knuckles cartidge with Disney's Aladdin inserted on the top.
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