For another four-ish hours the Orcs Must Die franchise is 75 percent off on Steam. Robot Entertainment's original third-person tower defense splattertacular is currently $2.49, while the cooperative sequel is $3.74. Grab the whole franchise and its DLC for $8.74.
Although the sequel can be played alone, as we noted in our review
, it's best with a buddy. Good times guaranteed.%Gallery-166490%