: Such archives often include "sdktools" or repository-specific folders containing development test maps. These maps, such as devtest , were used by Valve to test new features like gels, tractor beams, and excursion funnels.
: Unlike the standard Steam release, these builds often contain Program Database (PDB) files. These allow modders and data miners to decompile parts of the game more effectively to understand its inner workings. Portal 2 Build 24022022-OFME.rar
: Researchers have identified unique Source Filmmaker (.dmx) project files within these types of leaked dev builds, such as glados_flythru.dmx , which provides insight into how Valve choreographed its cinematic trailers. Relation to Major Leaks These allow modders and data miners to decompile
: In June 2022, a massive trove of developer maps for both Portal 1 and Portal 2 was found in the files of the Nintendo Switch release. These maps were previously absent from the PC version. These maps were previously absent from the PC version