Sega presents its argument for the renaming of the Xbox 360 "Games on Demand" service today (to something like "Here are Some Games,") with the release of Sonic Free Riders. We don't know who's been demanding immediate, at-home access to Sega's Kinect-only mascot hoverboard racer, but if you're part of that invisible contingent, here you go. It costs $50.
Okay, so it may not be the most desirable title, but Sonic Free Riders is actually one of just two Kinect titles on Games on Demand. Or the only one, depending on how you'd categorize Your Shape: Fitness Evolved.