Analysis of information sources in references of the Wikipedia article "PLATO" in Romanian language version.
Jim Schwaiger's 1977 game Oubliette (inspired by Dungeons & Dragons and Chuck Miller's earlier multiplayer game, Mines of Moria) had a first-person point of view and used line graphics to render the scene ahead. [...] In late 1979, the first ever fully functional graphical virtual world was released: Avatar. Written by a group of students to out-do Oubliette, it was to become the most successful PLATO game ever--it accounted for 6% of all the hours spent on the system between September 1978 and May 1985.
