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If you are using the Xbox then unfortunately no, but for the computer there is the developers console.
There are no cheats on the console game and I have never played the PC game.
no there are no cheats but i know a few glitches one if you jump from a high height to a lower but to on the ground you will live with no injury's
the campaigns for left 4 dead are: NO MERCY BLOOD HARVEST DEAD AIR DEATH TOLL
There are a few sites, check out the Left 4 Dead forums online.