Named Game of the Year by over 50 publications, Valve's début title blends action and adventure with award-winning technology to create a frighteningly realistic world where players must think to survive. Also includes an exciting multiplayer mode that allows you to play against friends and enemies around the world.
A mod which does not really need to be played, unless of course you really want to. Made for a friend with the flu.
LoL, it's the funniest idea among any HL mods with comic theme.