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Synergy 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. Synergy maintains the normal Half-Life 2 gameplay whilst slightly tweaking and modifying it with unique ideas.Contribute