Ok as you know the game just came out today but I know some of the guys from my school bought,played and finished it last night! What a bunch of nerds!
Anyway I myself played the demo at school And let me tell you...
It was flippin awesome!!!

In case your not familiar with the game, this is the second game from Valve. The first game is just Left 4 Dead anyway I'll explain a little bit about it because theres simply too much! anyway again its about how the world as changed due to a infectious virus (kinda like rabies,cause the zombies in the game don't eat flesh but rather attack and kill you) so now theres zombies every where! so you can play as one of four survivors who are:

Bill: old vietnam veteran who is totally awesome!
Francis: Bar brawling, law breaking biker guy
Louis: unappreciated office computer analysts worker
Zoey: lazy college student (the only girl)

There are four campaigns you have to survive through:
No Mercy:journey through the city to a hospital to be rescued by helicopter.
Death Toll:Journey through a small town to be rescued by a boat.
Blood Harvest:Journey through farm fields and train yard to be rescued by military.
Dead Air:Journey through a airport and survive until the plane is full so you can escape.

Also it's not just rabid zombies you have to worry about, you also have to worry about special infected zombies to deal with too! Here they are:
The Smoker: A skinny zombie with a super long tongue that likes to perch some where high and hidden to snag you, listen for his coughing. Once caught you need help to escape.
The Hunter:A zombie in a hoodie that can climb on walls to pounce on you and scratch you up, listen for his high pitch shriek. once on you you need help to get him off.
The Boomer:A fat gross zombie that vomits on you if you not careful,his bile attracts a lot of zombies!,listen for his gagging.
The Tank:A big brute zombie with huge muscular arms that either throw you or throw concrete at you!, stay as far away from his as you can! watch him when thing literally start shaking.
The Witch:The most strongest and creepiest of all! the witch is the only female SE, one hit from her can take you down so your friends need to help you or else.the way to find is you'll notice her crying, she is usually in a dark spot or corner or out in the open, she sits down and crys so you can't shine light or shot by her or else you startle her. she grows when you get too close. for noobies who want to play or have just played it best to avoid her at all cost but for more advanced players its ok to experiment! just run!

See I told you there was alot and I haven't even explained items which I'm not.

Anyway the demo was so freaky and fun, me and my friends Hannah got a lot of close calls, I have no idea how we survived to the second chapter XD There are new survivors, new weapons and items with new campaign in an infected Louisiana and New Orleans but anyway its cool if you have a Xbox or PC you should check it out but beware or graphic images and a bit of graphic language, I ignore it, the game has been banned in australia.

Thanks for reading my so called little run down of the game!