Uno Rush is a Xbox Live Arcade

Xbox Live Arcade

Xbox Live Arcade is a type of video game download distribution available primarily in a section of the Xbox Live Marketplace, Microsoft's digital distribution network for the Xbox 360, that focuses on smaller downloadable games from both major publishers and independent game developers...

 game based on the Uno card game. The game was expected to be released alongside the new Xbox experience, showcasing the games functionality of the Xbox 360 Avatars, but was delayed for various reasons. Uno Rush was released on March 25, 2009 for 800 Microsoft Points

Microsoft Points

Microsoft Points are the currency of the Xbox Live Marketplace, Games for Windows - Live Marketplace, Windows Live Gallery, and Zune online stores. The points allow users to purchase content without a credit card and to reduce the number of small credit card transaction fees, which Microsoft would...

(~$10 USD) as part of Xbox Live's "Days of Arcade" promotion.