A role-playing video game (commonly referred to as role-playing game or rpg, as well as computer role-playing game or crpg) is a video game genre where the player controls the actions of a character (and/or several party members) immersed in some well-defined world. Many role-playing video games have origins in tabletop role-playing games (Including Dungeons & Dragons) and use much of the same terminology, settings and game mechanics. Other major similarities with pen-and-paper games include developed story-telling and narrative elements, player character development, complexity, as well as replayability and immersion. The electronic medium removes the necessity for a gamemaster and increases combat resolution speed. Rpgs have evolved from simple text-based console-window games into visually rich 3d experiences.