Killing Floor

[Wolfe]

This game was originally a mod in UT 2.5 from what I read but Tripwire made a total conversion meaning it's a full game now.

The gameplay consists of a single game type, single- or multi-player, in which the player fights through waves of zombie-like monsters (or more precisely, specimens from a failed military experiment), with each wave becoming successively more difficult, moving through each area of the level, until it concludes with a battle with a super-specimen, called the Patriarch.

It has 6 different perks which I'm sure you're familiar with if you've played Call of Duty. If you haven't then I guess you can compare them to classes in an RPG on a smaller scale. This is more of a budget game ($15 pre-purchase, $20 on release) but still fun to play once in a while nonetheless. A lot of people compare this to Left 4 Dead but to be honest I like and play both.

Video:
http://www.youtube.com/watch?v=ahAhSlfKpU0

If anyone plays this PM me and we can play sometime.