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.
Sven Co-op is holding a mapping contest, with various prizes to be won! Apart from general quality, the main criteria is that maps be unique and unconventional...