A first-person shooter developed by Human Head Studios and produced by 3D Realms and thanks to Venom Games it is available on Xbox 360. Featuring a single and multiplayer, this game can get very crazy at times. In the campaign not only are you shooting hell out of extraterrestrial beings that are harvesting humans, but you also have to solve puzzles. Of course some puzzles are easier than others. Get ready to use your trigger finger and your brain.