Doom3

Doom3, in my oppinion is by far the greatest 'id' game ever. It starts off where you are appointed too look for missing scientists on the planet mars. Turns out that everyone is a zombie or some sort of horrifying monster, of that matter, the scientists are aswell infected with whatever is causing them to be zombies. You go through many hours of zombie blasting with many realiztic weapons to choose from. The only bad thing is that this game is so huge that you will need the latest graphics card to run it as well as lots of RAM and a good computer, but it is deffinently worth it.