It is the assembly source code file for the early "Simon Wai" prototype of Sonic the Hedgehog 2.

The file is an uncompressed ROM image of Sonic the Hedgehog 2 (Revision 1) for the Sega Genesis/Mega Drive. It is primarily found within the "uncompressed ROMs" folder of the SEGA Mega Drive & Genesis Classics collection on Steam.

: In the Steam version, it is typically found in the uncompressed ROMs folder. Common Community Uses

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