By the time you read this, Valve will have announced the existence of Left 4 Dead 2 at Microsoft's E3 press conference. By watching the announcement trailer, you'll discover that there are new characters, special zombies, and even melee weapons like a chain saw. But if you want to learn more, read on, because we were at Valve last week to actually play through one of the sequel's campaigns (the E3 demo only features the first two levels of the campaign that we played), and we got all the bloody details.

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