Classic Sonic's Prototype Collection

Sonic CD - Title Screen (510 Prototype)

Sonic 2 - Unused Auto Demo

Sonic & Knuckles - Title Screen (Sonic & Knuckles 0525 Prototype)

Sonic 2 - Stage Select (Simon Wai Prototype)

Sonic CD - You Can Do Anything (v0.02 Prototype)

Sonic 2 - Green Hill Zone (Simon Wai Prototype)

Sonic 2 - Chemical Plant Zone (Simon Wai Prototype)

Sonic 2 - Neo Green Hill Zone (Simon Wai Prototype)

Sonic 2 - Casino Night Zone (Simon Wai Prototype)

Sonic 2 - Hill Top Zone (Simon Wai Prototype)

Sonic 2 - Dust Hill Zone (Simon Wai Prototype)

Sonic 2 - Proto Palace Zone (2013 Remake)

Sonic 2 - Sand Shower Zone (Simon Wai Prototype)

Sonic 2 - Metropolis Zone (Simon Wai Prototype)

Sonic 2 - Rock World Zone (Simon Wai Prototype)

Sonic 2 - Wing Fortress Zone (Simon Wai Prototype)

Sonic 3 - Angel Island Zone - Act 1 (November 3 1993 Prototype)

Sonic 3 - Angel Island Zone - Act 2 (November 3 1993 Prototype)

Sonic CD - Salad Plains Zone (v0.02 Prototype)

Sonic CD - Palmtree Panic: Past (v0.51 Prototype)