Sven Co-op
Sven Co-op is a co-operative mod originally based around Valve Software’s Half-Life. In this mod players must work together against computer controlled enemies and solve puzzles as a team. While Sven Co-op is similar to…
Half-Life 2: Synergy
Synergy is a simple Half-Life 2 Modification (Mod) that enables you to play through the Half-Life 2 series and many other 3rd-party campaigns cooperatively with friends.