What is left 4 dead 2 about

Its about 4 Survivors surviving in 5 different environments (you pick in campaign mode) killing mass amounts of zombies
Now based in the south moving your way to louisiana. Nick,Rochelle,Coach and Ellis fight there way
through 5 campaigns : Swamp Fever, The Parish and Dark carnival, Hard Rain, and Dead Center. Now with melee weapons: axe, bat, frying pan, batton,katano,machete,crowbar and the chain saw
With 3 new infected Jockey,Charger and the spitter. there will also add new guns including the AK-47, Combat Rifle, Combat sniper, tactical shotgun, and Desert Eagle (Called a magnum in the game). It will also add new equipment like the Bile Bomb, This attracts zombie to the zombie you throw it at. The Difibulater, this revives dead players. Adrenaline, This increases your running speed but decreases you melee attack.
chine gun

You forgot Chrome Shotgun
Sub Machine pistol i think its what is called
Combat shotgun

There are more campaings. There are 4 more survivors in other levels. Zoey, Bill, and 2 more.

RECENT: Those two more are Francis and Louis. Anyway, I'll explain in detail what it is about rather than what guns are in it.

You are 4 survivors strangely not infected who fight your way to get into New Orleans, so you can escape the infection. The fictional country, Fort Harris, has been quarantined and you must escape bombing in order to survive. Everyone around you is infected and willing to kill you. Throughout the story, you will learn about the failures of Ceda, the organisation which were trying to stop the infection, the destruction by the military and why you are not infected and what that does to people. You can play as one of the four characters, such as Ellis, Coach, Rochelle or Nick. The 5 campaigns you get for free include:

Dead Center: You are strangely ignored by a rescue helicopter and must fight through from the roof to the ground floor of the hotel in order to reach the mall, where you see lights and where the helicopter was going too. However, as you reach it, you find it is deserted and dead, as it became over-run. You do however, find Jimmy Gibbs Jnr.'s racing stock car, which you fill up and use to escape the increasing hordes of infected which keep on pouring in.

Dark Carnival: A ironic level, where you must fight through a carnival called "Whispering Oaks" after your car gets stuck in a heap of stranded cars, and get to the stage where you can launch off the fireworks display by "The Midnight Riders" who were suppose to play there, in order to attract attention and get rescued. However, this attracts the infected's attention too.

Swamp Fever: The pilot of the helicopter turns out to be infected, and you must fight through hillbilly swamp areas in order to contact someone and get help. You meet Virgil, who has a boat which you can use to escape, but it's loud motoring does not bring little attention.

Hard Rain: A uncanny level, which is a travelling level. You leave the boat forgetting the weapons you brought, and so must scavenge for weapons and health. However, you are left with the choice of bringing the supplies in the restaurant to be better armed, or leaving them there so you have more supplies to withstand the hordes which come. You travel through a neighborhood and a sugar mill, which is haunted by lots of witches. Furthermore, it rains heavily, and your movement is slowed down. You either engage the witches or try to avoid them, but don't be so clever that you get two of them on you. You collect fuel at a fuel station, and now must return back to where you started and signal Virgil via the restaurants sign in order to get back on the boat. However, be thankful you left the supplies in the restaurant ready for the finale.

The Parish: The final campaign, and arguable the hardest. You must fight through a city and various buildings and alleyways to get a bridge. During this, the army is bombing the city heavily to kill the infected. Once you get on the bridge, you must contact the authorities, who tell you to lower the bridge to get the extraction point, but the noise will only attract hundreds of infected. Therefore, you must run across, for the more you stay there, the more infected there comes. It is tiresome and dangerous, and it is likely that a charger can charge you off the bridge to your death. Once you get to the main road to the right of the end of the bridge, you must keep going until you get to the rescue helicopter at the end, which will take you to safety. This was the last, so it wasn't meant to be easy.

If you make it, you get a special little prize on XBOX, not sure on P.C. This only counts if you play the full campaign You cannot stop at level 2 and start there again. You must start all over again.