Return to hell with the Zombie Army 4 collaborating with Left 4 Dead 2.
Source: N4G PC Zombie Army 4 Adds New Left 4 Dead 2 DLC and Brings on Return to Hell Campaign
Return to hell with the Zombie Army 4 collaborating with Left 4 Dead 2.
Source: N4G PC Zombie Army 4 Adds New Left 4 Dead 2 DLC and Brings on Return to Hell Campaign