Sonic the Hedgehog Chaos (1993)

Dr. Robotnik has stolen the Red Chaos Emerald, causing the other five to "lose balance" and scatter themselves into a parallel universe. As a result of the instability, South Island is now sinking into the ocean. It is up to Sonic and Tails to find the Chaos Emeralds and restore harmony to the universe, or else the innocent residents of South Island will find themselves taking a long swim.

Sonic Chaos, Sonic & Tails, ソニック＆テイルス

Sonic the Hedgehog Chaos credits (SEGA Master System, 1993) - MobyGames

Sonic Chaos sega Game Gear 1993 Original Game Cartridge

VideoGameArt&Tidbits on X: Sonic Chaos - Game Gear two-page ad (1993). / X

Sonic the Hedgehog Chaos (Video Game 1993) - IMDb

Longplay of Sonic the Hedgehog Chaos

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Sonic Chaos, Sonic Wiki Zone

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Sonic the Hedgehog Chaos (Video Game 1993) - IMDb

Sonic The Hedgeblog on X: Comparison of the running animation for 'Sonic Chaos', across @HiddenPalaceOrg's May 17, 1993 prototype and the final game. / X