Left 4 Dead - Solo Run Guide

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Gameinfo:
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Set in a modern day survival-horror universe, the co-operative 
gameplay of L4D casts four “Survivors” in an epic struggle against
hordes of swarming zombies and terrifying “Boss Infected” mutants.

Valve’s next generation AI technology, allows for games of 1 to 8 
players. Players can play as a Survivor or as one of four types of
“Boss Infected,” each of whom possess a unique mutant ability such
as a 50-foot tongue lasso or a giant belly full of explosive methane
gas.

The gameplay takes place across four massive campaigns. The “zombie” 
population of each mission is choreographed by an “AI Director” that 
monitors the human players’ actions and creates a unique and dramatic
experience for them on the fly.