In case you haven't heard yet, Trendy Entertainment's RPG/tower-defense lovechild Dungeon Defenders is a pretty great game. And so is Orcs Must Die! At these discounts though, it can only get better. Gold members can nab the strategy gems for 33% and 50% off, respectively, as part of Xbox Live's Deal of the Week, making them a paltry 800 and 600 Microsoft Points.
With the remainder of the four-part DLC campaign for Dungeon Defenders on the way (and the game's insanely addictive qualities) it's definitely a great time to jump in and get caught up. Also on sale are South Park: Let's Go Tower Defense Play (50% off, 400 Points) and Defense Grid: The Awakening (50% off, 400 Points).