Unreleased games

This article includes unused content on games that are cancelled or unreleased.

Sonic Crackers
See Sonic Crackers.

Sonic's Edusoft
Sonic's Edusoft is a scrapped educational game. Sonic the Hedgehog's Gameworld became the first educational Sonic game.

Unused badniks/animals
These sprites go unused since there is no badnik destroying.

Sonic X-treme
See Sonic X-treme.

Sonic 1/2 CD
See Sonic CD.

Knuckles in Sonic 1
See Sonic and Knuckles.

Sonic 1 for Home Computers
See Sonic the Hedgehog.

SegaSonic Bros.
SegaSonic Bros. is an cancelled game for the Sega System C2.

Sonic the Hedgehog Band
The ROM includes sprites for Sonic's band members, a concept from the development of Sonic the Hedgehog that never ended up being used (though Vector the Crocodile went on to co-star in Knuckles' Chaotix).

Gallery
TBA

Sonic Ride
In the videos for Sonic Jam, there is an video for an unreleased ride. You can see it on https://www.youtube.com/watch?v=Wt4Lg2E-cyE.

Sonic DS
Sonic DS is an cancelled Nintendo DS game. The footage can be seen on https://www.youtube.com/watch?v=YogdnPhHRec.

Untitled STI Sonic game
There is an screenshot of an unknown Sonic game. The mockup was created before the release of Sonic 3D Blast and development of the Sega 32X add-on.

Sonic-16
This unreleased game is based off the Sonic the Hedgehog cartoon that aired at the time, but the game was never developed fully. This is another phase of Sonic X-treme.

Sonic Mars
Sonic Mars was a game planning for the 32X but it was cancelled likely due to the 32X's commercial failure.

Sonic Saturn
Sonic Saturn is an unreleased Sega Saturn game that was made but cancelled along with Sonic X-treme. There is also an minigame called Sonic Pool.

Sonic X: Chaos Emerald Chaos
Despite not being an game, there is an unreleased Game Boy Advance video cartridge named Chaos Emerald Chaos.

Sonic the Hedgehog Extreme
Not to be confused with Sonic X-treme, this was an unreleased Xbox game that was an hoverboarding game. It uses a few music tracks from Sonic Adventure 2.