Sonic X-Treme - Desciclopédia

Sonic X-Treme Build Goes Public and Becomes Playable - Hey Poor Player

Sonic vs. Knuckles - Desciclopédia

Sonic X-treme (Project Condor) - Sonic Retro

Sonic X-Treme Unity (Project SXU) by Etendo - Game Jolt

File:Sonic X-Treme.webp - Wikimedia Commons

Secrets of Sonic Team=

Sonic for Hire - Desciclopédia

SONIC X-TREME [SONIC X] by DOMREP1 on DeviantArt

Sonic X-Treme: 10 Things You Never Knew About The Canceled Sega

Sonic X-Treme, Sega Wiki

IGN talks about Sonic X-treme - Unseen64

Sonic the Hedgehog - Desciclopédia

Sonic X-Treme (found build of unreleased SEGA Saturn platformer