 Myst Online 's gameplay is a massively multiplayer online game , where players interact with others to solve puzzles and advance the story . Players communicate with others using a " Ki " , an artifact which provides a special interface . Each player has their own personal Age , called Relto ; unlike in public areas , each player 's Relto is different depending on the player 's tastes . In public areas , any action a player takes is persistent and remains part of that world — kick a stone in one player 's game , for instance , and the stone will be moved when any other player enters the area . 
