http://store.steampowered.com/app/224260/NMRiH is a HL2 tactical zombie survival mod, think Left 4 Dead only with slow zombies and a lot harder. Ammo and guns are very scarce and body shots on zombies are almost useless, and you can't swing the larger melee weapons very often without getting tired. There are status effects like bleeding and infection, dead players also become AI zombies after death
. And there are lots of community made maps and skins for characters on the official forums. Good fun with friends if you don't mind how difficult it can be sometimes.
