killing-floorKilling Floor, the promising co-op FPS survival game developed by Tripwire Interactive is now available for pre-purchase via Steam, with some bonuses for those who decide to pay for it early: a discount!

The game represents the evolution of an mod for Unreal Tournament 2004 which sees players teaming up to battle zombies in London. Killing Floor can be played both offline and online, and it allows players to team up with up to five others in their quest for survival. In other words, a new Left 4 Dead for those who like the game but would like to try something new, too.

And it seems to be also of high quality, so it might worth pre-purchasing the title: you will get a 25% discount off the retail price (which is $19.99), which means that you’ll only have to pay $15 for Killing Floor, which is a really low price.

You can check out more about the game (including a new and cool gameplay trailer) on the Steam page of the game.