A Half-Life 2 co-operative mod created on the Source Engine.
OverviewSynergy is a Half-Life 2 cooperative modification for the Source Engine which allows you to play through Half-Life 2, Half-Life 2: Episode One and Half-Life 2: Episode Two, as well as levels made specifically for Synergy playable in Deathmatch and Teamplay gamemodes, with other players; it also supports installation of other Source Mods for cooperative play.
