Original sentence: " A dungeon complete with passageways, rooms, treasure, monsters and other encounters could easily and randomly be constructed as the player progressed.A useful features of the first two versions of the Guide was the Random Dungeon Generator (RDG).It could be used with several people or a single player.The RDG was not included in the subsequent versions of the Dungeon Master's Guide past the second.The generator allowed, by the rolling of dice, to generate a dungeon adventure "on the fly.This was a useful tool to play the game when others weren't available to play or to have an adventure without preparing an campaign beforehand