Massively multiplayer games (the genre's official name) have existed for years and have a proven, lucrative cult following. Today's wizards-and-warriors worlds such as Ultima Online and EverQuest boast thousands of paying inhabitants, but online game fees still account for a small fraction of the $11 billion PC and video game industry in the USA. The most recent attempt to widen online games' appeal —The Sims Online, based on the best-selling PC series — has met with disappointing results.