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'Left 4 Dead' spreads its infection to 'Payday: The Heist' in 'No Mercy' crossover

Left 4 Dead meets Payday: The Heist in new crossover campaign. Valve has lent one of Left 4 Dead's most iconic campaign maps, the climactic "No Mercy" hospital level, to Overkill Software's P...

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Overkill and Valve to blend 'Left 4 Dead' and 'Payday: The Heist'

Overkill Entertainment to collaborate with Valve in Left 4 Dead/Payday: The Heist blend Overkill Entertainment is teaming up with Valve to collaborate on a project involving Payday: The Heist and L...