A Sega Saturn version was in development, but cancelled. Theme Hospital was a commercial success, selling over 4 million copies worldwide, and was ported to the PlayStation in 1998. The game received a generally positive reception, with reviewers praising the graphics and humour in particular. Multiplayer support with up to four players was added in a patch. Designers originally planned to include four distinct gameplay modes corresponding to historical time periods, but this was dropped due to time pressures on the team. Peter Molyneux and James Leach came up with the idea of creating a Theme game based on a hospital, but Molyneux was not directly involved in development due to his work on Dungeon Keeper. The game is noted for its humour, and contains numerous references to pop culture. The game is the thematic successor to Theme Park, also produced by Bullfrog, and the second instalment in their Theme series, and part of their Designer Series. Theme Hospital is a business simulation game developed by Bullfrog Productions and published by Electronic Arts in 1997 for MS-DOS and Microsoft Windows compatible PCs in which players design and operate a privately owned hospital with the goal of curing patients of fictitious comical ailments.