How much do you really know about first-person shooters? It may be the most popular genre in gaming, and a surprisingly simple concept to grasp, but there's also real depth to it. To test your knowledge, we've created this quiz, which will give you a slap to the brain rather than a shot to the head. So go on, take the quiz and prove your shooter smarts. If you get a perfect score (you cheated, didn't you) feel free to share it in the comments.