Left 4 Dead is Valve’s new 1st person shooter this season, but features a unique co-op twist.  The game is 95% multiplayer, and while you can play it by yourself you would just be cheating your own experience.  The premise of the game is that you and 3 other people are the survivors of a zombie apocalypse and you must get rescued.  The 4 survivors, while looking different as far as age, body type and gender do not play different from each other, but their different personalities give added depth.  I say this because there is no “plot” to the game other that there are zombies, and you need to kill them.  Each character however has their own feedback, remarks and personalities which makes them feel more real and fun to play.  As of now the game ships with 4 “movies” that you can play through with your friends, though they have promised more content updates which Valve has said will be free.  As well as the co-op side of the game, L4D also features a Versus mode.  In this mode, players can play as both the survivors and the infected.  This is a fun alternative and makes both sides play entirely differently, and makes for some very fun matches.  I completely recommend this game if you are a fan of shooters, zombies, or co-op games.  The atmosphere is fun, the gameplay is fast, and the experience is unforgettable.