Users who own this game also own:

Payday: The Heist
Payday: The Heist
Left 4 Dead 2
Left 4 Dead 2
Team Fortress 2
Team Fortress 2
Portal
Portal
Left 4 Dead
Left 4 Dead

Users who love this game also love:

Quake II
Quake II
Half-Life 2
Half-Life 2
Minecraft
Minecraft
Resident Evil 5
Resident Evil 5
Doom
Doom