At this point, you might think the entire history of a major gaming company like Konami would be well and fully documented. But you'd be wrong in the case of Space School, a series of game-like educational Famicom cartridges Konami designed for Japanese elementary school children in the '80s.

Designed in partnership with Japanese broadcaster NHK, the Space School series was never available in stores, and it could only be ordered directly by the schools themselves. The games also made use of a special "QTa" adapter that fitted Konami's specially designed 40-pin cartridges into the 60-pin slot of the Famicom.

Both of those factors made these games some of the rarest and most expensive in the Famicom collector's market. It also made reliable information about the titles hard to find—while a few Space School ROM files were floating around, their unique memory mapper configuration made them practically unplayable on modern emulators.

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