Carmen Sandiego

Carmen Sandiego is a game that was first sold in 1985. The game taught history and geography through a plot line of a detective agency pursuing a criminal called Carmen Sandiego. As the game developed it was expanded to also teach other subjects. As of 2014, the game continues to be sold and used as a product of Houghton Mifflin Harcourt.

Official site
Carmen Sandiego's travels via Twitter (@CarmenSandiego)
Broderbund's 1989 version
Broderbund's 1990 version