Zeit Squared shoots up XBLA

Leading the pack this week is Ubisoft's Zeit Squared (800 MS points, or $10). A shoot-'em-up, the 2D side-scroller has players blasting through enemies and using the rewind-time feature to use their ghosts to help them defeat foes. The game sports six game modes, 70 challenges, and eight bosses for players to defeat.

Added to the Games on Demand hub this week were three titles, the first of which is Electronic Arts' racing title Need for Speed: Shift ($30). Also out on the download space now is Capcom's Super Street Fighter IV ($40) and Atlus' strategy title Operation Darkness ($40).

Health-minded Kinect gamers can download a demo for The Biggest Loser: Ultimate Workout today from the Xbox Live Marketplace. The sampler gives players a look and feel for the Kinect-enabled title where gamers can track caloric intake, participate in workouts, and record a video diary to track progress.

Gamers looking for a deal can download a range of Activision properties for half their usual going rate. Call of Duty map packs, Guitar Hero: Warriors of Rock track packs, DJ Hero 2 mixes, and more are 50 percent off until January 17. For a full list of discounted titles, check out Major Nelson’s blog.