operation hydra, a free update to the game, was released august 29. the update added new missions and achievements, the ability to buy certain power weapons with xp rather than real currency, and support for the xbox 360 controller. a demo version of the game, featuring a tutorial and single mission, was released on august 30. the update also added compatibility for windows phone hardware with 512mb of ram, and enabled play using an xbox gamepad on windows computers.