As it's now Tuesday, it's time for another weekly Humble Bundle sale and it's none other than Tripwire, developers of Red Orchestra and Killing Floor. Although I was not a fan, both games have a massive following. Red Orchestra 1 and 2 feature first person combat during WW2 at the Russian Front and excels in multiplayer. Whereas Killing Floor is more towards waves of undead creatures in a first person multiplayer, and a damn fine game it is too.