Share this postA Piece of the Pi: mathematics explainedThe Fifteen Puzzle and its variantsCopy linkFacebookEmailNotesMoreThe Fifteen Puzzle and its variantsRichard GreenJul 29, 2023∙ Paid6Share this postA Piece of the Pi: mathematics explainedThe Fifteen Puzzle and its variantsCopy linkFacebookEmailNotesMore1ShareThe Fifteen Puzzle, which was invented by Noyes Chapman in the 1870s, is thought to be the oldest type of sliding puzzle. The puzzle consists of fifteen squares that can be slid around a 4 by 4 grid.…This post is for paid subscribersSubscribeAlready a paid subscriber? Sign inPreviousNext