You never learn exactly what happened, but the rich environments and thoughtful graffiti set the stage expertly. You'll travel through urban, suburban, and rural areas, each one grim, desolate, and littered with evidence of the apocalyptic event.

The first four levels end in safe houses (places to heal and rearm free of the zombie menace), and the final level ends in a desperate stand as you wait for your rescue vehicle to arrive. There are four campaigns in Left 4 Dead, each spanning five levels. For the last time, zombie doctor, you can NOT take my temperature! Despite these hitches, Left 4 Dead is a remarkably fun, excitingly tense game that will make you want to revisit the apocalypse again and again. Human teammates (or enemies) make each play-through dynamic, mitigating the game's two hang-ups: limited map selection and uninspired friendly AI. Nevertheless, Left 4 Dead's well-crafted gameplay simply must be experienced in multiplayer. It's equally thrilling to play as one of the zombies (aka the infected), coordinating deadly ambushes as you try to kill the survivors.

Battling your way through the grim, desolate world is always tense and challenging, thanks to the unpredictable, relentless enemies. When most humans have been turned into shambling, flesh-hungry monsters, how will you fare? Whether you fancy yourself an intrepid survivor or an infected savage, Left 4 Dead is the game for you.

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