

Sonic Extreme was a prototype video game developed by Vision Scape Interactive in May 2003. Conceived as a spin-off of Sega's Sonic the Hedgehog franchise, the game showcased Sonic and Shadow using hoverboards in an open-world setting inspired by Green Hill Zone, with gameplay compared to Tony Hawk's Pro Skater. The game included three distinct modes, such as collecting keys and Chaos Emeralds, as well as battling or racing against another player.
| XBOX | TBD |
| NGC | TBD |
| PS2 | TBD |