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...
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...