Orcs Must Die! is a new Xbox Live Arcade and PC game developed by Robot Entertainment, best known for hit games such as Halo Wars, Age of Empires II, and Age of Empires Online. Orcs Must Die! brings some controversial twists to the old school genre of tower defense games – but, by changing the entire way the tower defense genre is portrayed and delivered, has the developer taken a bold step with Orcs Must Die! or undermined what made the genre fun in the first place?