

One of the stand out mods would be the Black Mesa project - whereby Half Life 1 is being remade into the Source engine, used to make Half Life 2. It takes part in the realms of Half Life 2, but from memory the location doesn't appear in the full game.

It is possible to play this on the PC (as someone has managed to port it onto the PC). It takes place during the events of the first game. This is a coop game mode available on the Half-Life PS2 release. Someone has already mentioned " Half-Life Decay". Half-Life 2 Episode 2 - Continue as Gordon Freeman after the events of Half-Life 2 Episode 1.Half-Life 2 Episode 1 - Continue as Gordon Freeman after the events of Half-Life 2.

