Game History: Team Fortress 2
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Team Fortress 2 SDK released
Valve ships a major Source SDK update with the full TF2 client and server code for modders.
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Jungle Inferno update
A major content update adds new weapons, maps and contracts.
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Mann vs. Machine update
A co-op mode pits a team of players against waves of robots.
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Team Fortress 2 goes free to play
Valve makes the game free to play, supported by its in-game Mann Co. Store.
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Team Fortress 2 launches
Valve's class-based shooter releases as part of The Orange Box on PC.