The phrase refers to the process of obtaining supplemental content, specifically a WAD file, compatible with a source port of the seminal first-person shooter, Doom, titled Legacy, that has been re-implemented in the Rust programming language. This content often includes new levels, enemies, weapons, or modifications to existing game mechanics.
Acquiring such files extends the playability and customizability of this specific version of the game. It provides opportunities to experience unique creations by the Doom modding community, fostering continued engagement with a classic title. Historically, this practice has been integral to the game’s longevity and evolution.