Might and Magic Book One: The Secret of the Inner Sanctum (also known as Might and Magic Book 1, Might and Magic 1, MM1 or simply Might and Magic) is an early role-playing video game released for the Apple II, IBM PC, NES and a number of other platforms, and is the first game in the Might and Magic series. It was published in 1986 by New World Computing and also later re-released in the Might and Magic VI: The Mandate of Heaven Limited Edition and then in Might and Magic VI: The Mandate of Heaven Special Edition.
The original Apple II version of the game was written almost single-handedly by Jon Van Caneghem over three years. Van Caneghem had difficulty finding a publisher to distribute MM1, so he handled the distribution himself from his own apartment until he was able to broker a deal with Activision.
Due to its popularity the game was ported to a number of other platforms that were popular at the time, and eight sequels were released over the next fifteen years.
A port of Might and Magic was released for Nintendo Entertainment System in 1992. While the basic gameplay was similar to ports released on earlier platforms, the graphics and general polish on the game reflected the later release date and greater capability of the Nintendo platform.
The game was remade again for release in Japan on the TurboGrafx-16 (PC Engine) platform. This version of the game was released on CD rather than cartridge and was able to feature digitized voices for dialogue as a result of the increased storage capacity offered by the CD medium.