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Wiktionary
role-playing video game

n. (context video games English) A genre of video game that uses gameplay elements found in a paper-and-pencil role-playing game (character classes, level up).

Wikipedia
Role-playing video game

A role-playing video game (commonly referred to as role-playing game or RPG, and in the past was also known 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 pen-and-paper 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.