SONIC 3 HYPE — Even MORE Sonic 2 concept art!

Even MORE Sonic 2 concept art!

Sonic Concept Art Shows Very Different Direction The Recent Games Could've Taken - GameSpot

New Sonic 2 Concept Art Uncovered

Sonic The Hedgehog Classic on the App Store

The making of Sonic the Hedgehog

Sonic the Hedgehog turns 23 today. Way past cool!

Prerelease:Sonic the Hedgehog 3/Concept Art - The Cutting Room Floor

Sonic The Hedgehog 2 Movie Poster Revealed Ahead Of A First Look At The Game Awards

The Behind-The-Scenes Story Of How Sonic 2 Became Sega's Ace In The Hole - Game Informer

Sonic 3 Level Concept Art Research Thread (with HQ Pictures)

Concept Art for Sonic 2's Post-Credits Scene Released - Media - Sonic Stadium