Sonic the Hedgehog (2006)/Gallery, Sega Wiki

Sonic the Hedgehog 2 (8-bit) — StrategyWiki

Sonic the Hedgehog/Gallery, Sega Wiki

Sonic the Hedgehog transparent image download, size: 573x866px

Shadow the Hedgehog - SmashWiki, the Super Smash Bros. wiki

Sonic the Hedgehog 2 (16-bit)/Development - Sonic Retro

Sonic the Hedgehog 2006 (lost build of Tokyo Toy Show tech demo of multiplatform platformer; 2005) - The Lost Media Wiki

Proto:Sonic the Hedgehog (2006) - The Cutting Room Floor

Sonic the Hedgehog (film) - Wikipedia

Sonic the Hedgehog/Gallery, Sega Wiki

Knuckles the Echidna - SmashWiki, the Super Smash Bros. wiki