Valve has become quite well known for its weekend sales on various titles.
The latest game to get special treatment from the internet based download store is the popular Left 4 Dead. Left 4 Dead is a first person zombie shooter that places a firm focus on co-op play.
The title has been selling on Steam since Saturday morning for 50% of its usual price. This makes it $24.99, roughly R250.
The special will run for the remainder of the weekend, so today is your last chance to take advantage of this sweet deal.
Valve has also recently announced upcoming DLC which should give the relatively short game a boost in the longevity department.