Play Half-Life with friends! Players fight computer-controlled monsters through the original Half-Life storyline or hundreds of available co-operative scenarios. Also includes a plethora of new weapons, enemies, visuals and gameplay systems. Customization features allow each map to use its own unique weapons and enemies.

Evisceral says

10/10 - Agree (5) Disagree

This mod is absolutely amazing. I played it years ago and it was so fun. I looked forward to it everyday and it still brings back amazing memories.

Today. Yes there might not be a lot of players on... but I bought a server exclusively for me and my friends, and it is still the best mod co op game (possibly game alone) i have ever played it.

Good job guys.