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.
this is purely my development of maps for the alien shooter theme, there will be a small pack of maps 4 pieces per passage and one fork map, I call it the entrance to the laboratory, this is as2.
How is it different than this upload: Moddb.com
There are 4 playable maps instead of 1. And they are other.