The folks at Atari and Behaviour are extending the life of Ghostbusters: Sanctum of Slime
with some new DLC. The Challenge Pack was made available yesterday for PC and XBLA for the price of 160 MS Pts. Essentially, it is a throwback to old-school coin-ops games with its two modes. In Arcade Challenge, it plays as a single-player game where you only get three lives and try to make it as far as possible. In the Lonely Hero mode, it is you vs. the paranormal with no help from your buddies. It sounds like a nice add-on for those that already own the title.