The income of companies providing persistent online games depends on the number of subscribers they attract. Since consumers have a choice of many products, each company is motivated to create the best possible experience for its customers. Role-playing adventures have no set length. When playing one of these games, it’s easy to spend more time on the computer than originally planned. Some subscribers cause harm to them-selves and others by spending too much time playing these games. Should the designers of persistent online games bear some moral responsibility for this problem?