sentence: Pwad files contain custom levels.
sentences_before: Doom' is split into three basic components, the engine, the Iwad file, and the optional Pwad file. The engine contains the code needed to run the game on a computer. The Iwad file contains the default levels, sounds, pictures, and other components.
sentences_after: The source code to the 'Doom' engine was released in 1997 and can be downloaded for free.
concept_name: pwad file
headings: Doom
categories: Shooter video games 1993 video games Doom series