would later become the model for early MUDs. A third game called Dungeon was released on PLATO in 1975, by John Daleske, Gary Fritz, Jan Good, Bill Gammel, and Mark Nakada. References External links The History of Computer Role-Playing Games Part 1: The Early Years (1980-1983) 1975 video games Cooperative video games Dungeons & Dragons video games Mainframe games Role-playing video games Video games developed in the United States Video games with textual graphics