Valve has once again mastered the art of multiplayer gaming when they released Left 4 dead for Xbox 360 and PC. Left 4 dead takes cooperative gameplay and combines it with good 'ol fashioned zombie blasting. 

You and your friends play any of the 4 survivors and must survive the 4 campaigns released thus far by valve. You and your friends also have the option to play against others in versus mode where 4 can play as the infected boss zombies or play the survivors. 

The genius behind Left 4 dead is the AI director that essentially changes where zombies and infected boss zombies might spawn and how many so each time you play through one of the campaigns (and you'll be playing them a lot) each time is a different experience from the last time you played it. Though there are only 4 campaigns valve has already promised to keep the campaigns coming, which is a good promise since it is a great game to keep playing again and again with friends. Playing with friends is how you can really get the most enjoyment out of it, if you play single player you can still enjoy the game but you just wont have that great interaction with friends playing. The AI for the survivors is really on par, you never really have to baby sit any of them, they can hold their own against zombies and follow you closely. 

Teamwork is the name of the game and is really the only way you can win, if you think you're just the best player in the world and go off running on your own, there's a good chance that a hunter will pounce you and then you'll get torn apart while your teammates laugh at you for being so stupid to go running off by yourself like that. Another way valve combated those "hero" players that run off on their own is when you get hit by a zombie it slows you down so if you get a group of zombies hitting you from behind you'll pretty much be stopped in your tracks and forced to stop and fend for yourself, this is where it is a good idea to have friends watching your back. Left 4 dead is a great multiplayer game and should be owned by anyone with an Xbox 360 or PC.