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Revision 1 of Sonic the Hedgehog for the Game Gear. There are no major differences between this and REV00.

A prototype of Sonic the Hedgehog for the Game Gear.

Sonic the Hedgehog (Master System)

Waku Waku Sonic Patrol Car (わくわくソニックパトカー Wakuwaku Sonikku Patokā?) is a children ride released in December 1991 exclusively in Japan. The arcade ride is part of Sega's "Wakuwaku" line[1] and features Sonic the Hedgehog playing the role of a police officer, patrolling the streets of a city and keeping it safe from Dr. Eggman. Both Japanese and English versions of the ride exist, though the Engli...

Sonic's Edusoft is an unreleased educational game featuring Sonic the Hedgehog and developed for the Sega Master System.

A game released for the Japan-exclusive Meganet expansion for the Mega Drive. The game wasn't known until a portion of the ROM was discovered by Sonic CulT in February 2004.

A revision released mainly in Japan and allegedly in low quantities worldwide. Contains a few fixes and enhancements.

The original game, the original beginning. Was compiled in late April or early May 1991. Released on June 23rd.

A prototype of Sonic the Hedgehog that was found by Buckaroo in late 2020 and released by Hidden Palace at midnight UTC on January 1st, 2021. The estimated date of the prototype is around March 1991, based on anecdotal evidence. The prototype clearly shows how Sonic's gameplay was going to be more about platforming than speed, which was completely overhauled for the final game.