Survive Giant Swarms
A good strategy is to find a corner and have a melee weapon equipped when you are about to be attacked by a horde of zombies. As the zombies approach hold RB and aim at them, you may get hit a few times but you have a better chance of surviving as you have less directions to defend.
More tricks, tips and cheats for this game are right here - Left 4 Dead 2 cheats
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