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15 puzzle

The Unofficial Apple Weblog (TUAW) found this 6/5/2009 on archimedes-lab.org

It is not clear when the first slide puzzle was invented (or made). But it is a known fact that in 1878 Sam Loyd, America's puzzle-expert, "drove the whole world crazy" with his newly "discovered" 14-15 puzzle (though some accounts state that, other authorities dispute this fact). Sam Loyd ...