It is also known for its extensive timing-based player versus player combat system. It is online-only and played by thousands of simultaneous users (who pay a monthly fee) on various game servers, also known as 'shards'. UO is a third-person/ isometric fantasy role-playing game set in the Ultima universe. Ultima Online's success opened the door for the creation of many exciting new massively multiplayer games that have or are about to hit the market.
