Each issue provides self-contained pre-written, playtested game scenarios, often called "modules" in early issues (it is now more common to just call them "adventures" or "scenarios"). Gamemasters can present these adventures to their players as written, or adapt them to their own campaign setting. By providing ideas, plots, villains, maps, monsters, and hooks, it can save gamemasters a great deal of time preparing a game for their players. As a magazine containing several modules per issue, it is also significantly cheaper than stand-alone modules, which perhaps explains its enduring popularity.