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Sonic Mars is a cancelled Sonic the Hedgehog originally designed for the Sega 32X. Likely due to the system's limitations and commercial failure, the project was moved to the Sega Saturn where it evolved into Sonic X-treme.
Sonic Mars is available on Sega 32X.
No — Sonic Mars is a single-player game.
Sonic Mars was developed by Sega Technical Institute and published by Sega.