Valve adds "all the Team Fortress 2 client and server game code" to its Source mod tools, letting modders "build completely new games based on TF2" and publish them on Steam

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The Source SDK is essentially a set offreely available mod toolsfrom Valve.

“Unlike the Steam Workshop or local content mods,” Valve explains.

The devs behind Pre-Fortress 2, another longstanding mod, are similarly excited.

“This also means all of your favorite TF2 Mods are probably going do the same!”