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 Alien themed mod for Half-life. Its just 3 maps but you can see what the dev was going for.
Oliver is the author of alien model. Real mapper/author of this mod is still unknown