Orcs Must Die! is an action-tower defense video game developed and published by Robot Entertainment and Mastertronic. It is a tower defense game that eschews the traditional top-down view of similar games, instead using a third-person action-oriented viewpoint. After being demonstrated at Penny Arcade Expo East 2011, the game was released via Xbox Live Arcade on October 5, 2011, and for Windows PCs on October 12, 2011. (wikipedia.org)