The site may have done something similar a while ago, but in case you missed that offer, you can catch up.

You have a little over one day left to get this game for free, and not for a limited time, either. Humble Bundle offers Killing Floor for free – and we also reviewed the sequel, which wasn’t a bad game at all. You just have to do the usual things: register on Humble Bundle in case you don’t have an account yet, then grab a code which you can activate on Steam to play whenever you are up to some killing. Tripwire wants more people to take a look at its franchise, and maybe also make us get interested in Killing Floor 2, too.

Have fun. Also, try to get a few friends to play along: it’s fun in co-op.