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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

Valve has just issued a massive Source SDK update giving modders access to the Team Fortress 2 game code, opening the door for them to build all-new games based on the classic FPS and publish those ...
GIGAZINE

Valve releases Team Fortress 2 game code, allowing anyone to build games based on Team Fortress 2

an SDK for the popular shooter game Team Fortress 2 (TF2). The TF2 development team claims that this will allow developers to create entirely new games based on TF2 ...
GamesRadar+

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

"We're already preparing for the porting efforts and a potential Steam release now that we've been legally enabled to pursue that," according to one mod dev When you purchase through links on our site ...