It was advertised BY proboards on this site. If I get in trouble for doing what they did, then I'm sorry. But this game is for the PC and it's free. You can download it from the above site, and you can read the strategy guide.
It's a First Person Shooter, and it's got a great online multiplayer. It's one of those games that you REALLY have to stay focused in.
The graphics are great too... and so is the game play.