This game and story is officially locked on the Playstation 2. It is a 2 player co-op entry in the Half-Life series. There is a fanmade mod that ports this to PC. While it does work (mostly), it is not easy to get it set up for multi-player, which is pretty much required to play the game the way it was meant to be played. It's similar to "A Way Out" and "It Takes Two", but good luck finding someone to play it all the way through with the clunky mods. An official re-release running on a newer engine with online player match-matching would be fantastic treat for Half-Life fans who want more official content and have never been able to experience this story which is part of the canon.