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Green Hill Zone, but it's Too Easy, I'm 99.9% sure YOU CAN PLAY THIS!
Sonic the Hedgehog: Special Zone
Sonic the Hedgehog piano collection
Sonic 1: Game Over
Sonic the Hedgehog - Game Over (SEGA) - Recorded by alexsteb [Piano Tutorial] // Synthesia
GREEN HILL ZONE from SONIC THE HEDGEHOG - Piano Tutorial
Sonic the Hedgehog (Sega/1991) Title Screen Comparison (US/JP)
Green Hill Zone - Sonic the Hedgehog [Piano Tutorial]