The game features an almost exact conversion of the original 1991 game as well as an option to play it in an enhanced HD 3D mode. It also has the standard Xbox Live Arcade features such as Leaderboards and Achievements.
As SEGA's response to the ubiquity of Mario, Sonic was a success specifically because of how unlike your usual Super Mario Bros. experience it was. It was still a run-to-the-right platformer set in a colorful and detail-rich fantasy world, but the focus on speed over intricate platform-jumping and hordes of enemies gave it a flavor of its own, one that SEGA has been mining with varying degrees of success for the past 16 years. Sega has re-released the original Sonic the Hedgehog many times over, with last year's appearance on the Wii Virtual Console being its most recent. And now it's arrived on Xbox Live Arcade.