Franchise: Halo
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Larry Niven (author of the Ringworld series of books) was once approached by Del Rey Books to write a Halo novel, but turned them down due to his lack of familiarity. Microsoft had even sent him an Xbox and a copy of Halo: Combat Evolved (among other games) to try to convince him.
subdirectory_arrow_right Halo DS (Game)
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During the development of Halo 3 and Halo Wars, Microsoft gave the rights to different companies to make a Halo MMO, as well as and a handheld Halo game. Both of these were never finished.