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The Sonic Advance 2 review prototype is a prototype build of Sonic Advance 2 for the Game Boy Advance. It was found by Clarkzer0, then dumped and released by Forest of Illusion.
This cartridge was a review build which came directly from Nintendo shortly after their licensing of the game. Its contents are the same as the final North American build; the only notable difference is a different maker code in the ROM's header.