Unbereakble achievment
Play this on either normal easy or advanced woudnt recomend expert do No mercy campaingn since you can skip the first part easily and it has the shorteset levels.I would pick up a heathe pack because if you get damaged enough and somebody tries to heal you you can just pull the first aid kit out and they should stop.Pain killers are important thosse are something to have it woundt count as healing.
More tricks, tips and cheats for this game are right here - Left 4 Dead cheats
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