Valve - the well-known creator of games like Halflife and CounterStrike - has entered the genre of zombie apocalypse games with the new title Left 4 Dead. This FPS game throws down the guantlet and challenges you to survive an endless horde of zombies while trying to get to safety. Although there have been zombie survival games in the past, they haven't really enveloped you in the idea that some of you very likely will not make it out alive. Left 4 Dead does just that, and even the developers have admitted to dying multiple times while playing. This game plunges you into a horrific world of zombies and if you manage to crawl out, you're very lucky.
In this game, you have the choice to play as one of four individuals. You can choose Francis, a tough looking biker with lots of tattoos. Or you can play as Louis, an IT geek who is out for a stroll among the zombies. Then there's Zoey, a college girl who enjoys horror movies. Finally there is Bill, a Vietnam veteran who brings battle experience to the team. It doesn't matter which one you choose, as they don't have different abilities or anything. They do however, each have a unique personality. In the single player game, you get to hear their vocalizations at various moments and it definitely adds to your immersion into the game.
Unfortunately, there's really not much storyline here. Other than a cinematic entrance, all you know is that you and these three other individuals are trying to survive without being torn to pieces by the zombies. There is no explanation for how you got there, and there's no story for why there are zombies everywhere - let alone why some of them have superhuman abilities. This can be either a good thing or a bad thing, depending on your perspective. If you are looking for a detailed story explaining how you got to point A and why the world has gone to hell-in-a-handbasket, you won't find it here. If however, you want to join some friends online in a team of four and systematically blow away zombies, Left 4 Dead is sure to satisfy. There are clues regarding a backstory, but its very hit and miss. The mystery that usually surrounds this type of genre is alive and well in this game, but the absence of a story doesn't really detract from the experience as much as you might think though. Perhaps in an expansion or add-on, they will fill in the gaps.
A decidely new and unique aspect of Left 4 Dead is The AI Director. This controller of AI dictates when and where the enemy will swarm all over you, and it takes into consideration a great deal of factors. The Director watches how you play, what your current status is (with regards to health, ammo, etc), and where you are in the game to decide just how many zombies to send your way. The AI Director also manipulates visuals, sounds, and even character vocalizations from your teammates as you progress through the game, customizing the experience every time you play. There is another Director that handles the music, and it decides what to play based upon what you have dealt with so far to provide you with an appropriate background theme. The music is performed client-side, so even in a multiplayer environment, every player is given their own customized score that continues as long as they are alive.