Why is it kept as Left 4 dead 2 is because There were only 4 of them in the world alive the others were zombies all around the world.There are only four levels and can be finished easily.
How can i say left 4 dead 2 is a shortest game because i started that game at morning 11:30 and finished it in 1:00 clock so i say that it is the shortest. If you are an member on the steam network you would play it online and finish.
I will give the download link here:
Click Here To Download On Torrent File
So enjoy seeing left for dead 2 trailer: