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This article is about a mod.
Synergy is a co-operative multiplayer modification for Half-Life 2, Lost Coast, Episode One, Episode Two, and SiN Episodes: Emergence, allowing up to 10 active players to play simultaneously. It also includes fan-made cooperative maps, as well as support for the mods MINERVA, Half-Life 2: Riot Act and City 7: Toronto Conflict. Official map support for Half-Life: Source was also confirmed to be coming in the future, along with a possible addition of a co-operative Black Mesa (mod). It is available for download on Steam. The latest version, v56.13, was released on March 28, 2015.
The mod features new co-op levels and allows the player to play with other players through the whole Half-Life 2 saga.