‘Mod makers, rejoice’: Valve shadow drops TF2 SDK to players’ delight

Make your own Heavy Update, folks.

Feb 18, 2025 - 23:18
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‘Mod makers, rejoice’: Valve shadow drops TF2 SDK to players’ delight

In typical fashion, Valve just made the Team Fortress 2 client and server game code public without much fanfare. However, this move has the potential to make a huge impact on the 17-year-old free-to-play shooter’s life going forward.

Valve released TF2’s game code to the public today, making it part of the Source SDK (Software Development Kit) on Feb. 18. Why is it big? Because this makes TF2 as close to open-source as possible. “This update will allow content creators to build completely new games based on TF2,” reads Valve’s blog post.