Sonic X-treme - Wikipedia

Sonic X-treme - Wikipedia

Sonic X-Treme Revisited - IGN

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Sonic X-Treme, Sega Wiki

SegaSonic the Hedgehog (lost build of cancelled 32X port of arcade platformer; existence unconfirmed; 1994) - The Lost Media Wiki

Knuckles the Echidna/Gallery - Sonic News Network, the Sonic Wiki

Sonic X-Treme, Sega Wiki

Super Sonic (lost build of cancelled Sega CD port of Sega Genesis platformer Sonic the Hedgehog 2; existence unconfirmed; 1992-1993) - The Lost Media Wiki

Sonic Xtreme Prototype - Colaboratory

Sonic X-Treme, Wiki

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Sonic X-treme STI Engines, Saturn, PC, Win95-PC+NV1, +V37 Level Editor