Capcom has announced its recently released downloadable title, Dead Rising 2: Case Zero, has broken all records on Xbox LIVE with the best week one unit sales in the history of Xbox LIVE Arcade.

Case Zero is a standalone experience that bridges the gap between the original Dead Rising and the soon to be released Dead Rising 2. The game introduces new protagonist, Chuck Greene and his daughter Katey.

Dead Rising 2: Case Zero is available now priced 400 MS Points. Dead Rising 2 is scheduled for release on September 24 for Xbox 360 and PS3, with the PC version to follow on September 28.