This article has a talk page!This page details development materials of Team Fortress 2.
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June 25th, 2007 PDB FilesPDB files left in the June 25th, 2007 build (that was leaked alongside the Postal III prototype) contain some early functions that were removed before release and are not found in either of the two codebase leaks.
September 12th, 2012 Codebase LeakOn September 12th, 2012, a Russian user of the website CSMania leaked a copy of the Source Engine 2007 codebase. The code dates to some time in 2008 and contained Team Fortress 2's source code.
April 21st, 2020 Codebase LeakOn April 21st, 2020, a member of a development team for a Portal project leaked a copy of the Source SDK 2013 MP codebase. The code dates to some point between August and October 2017, and contains source code for Team Fortress 2 shortly before the Jungle Inferno Update.
Source Developer Asset Repository LeaksThe Source Developer Asset Repository is the home to a lot of interesting unseen content. Various items have found their way into the hands of the general public over the years.
SDK ReleaseThe official, slightly amphibian-themed game code release for modders, made available on February 18th, 2025.
August 29th, 2026 Steam2 Content Server DumpOn August 29, 2026, a massive 13 terabyte archive was released online containing many builds of every single game ever uploaded to the pre-2013 Steam content server system (internally called steam2), and it contained Team Fortress 2 content.