Puzzle 15

thingiverse

A Fun Game for Kids and Adults This game is credited to various sources from the internet. Examples of Roalex Puzzles available for sale can be found online. The Jerry Slocum Puzzle World website provides information on puzzle history: http://www.puzzleworld.org/PuzzleWorld/jerry_slocum.htm The John Rausch Sliding Block Puzzles website offers information on sliding block puzzles, including the 15 puzzle: http://www.johnrausch.com/SlidingBlockPuzzles/15.htm Jaap's Puzzle Page provides information on various puzzles, including the 15 puzzle: http://www.jaapsch.net/puzzles/fifteen.htm The Wikipedia Fifteen Puzzle page offers a detailed description of the game: http://en.wikipedia.org/wiki/Fifteen_puzzle The Wikipedia Magic Square page explains how magic squares work: http://en.wikipedia.org/wiki/Magic_square Wolfram Math World provides information on magic squares: http://mathworld.wolfram.com/MagicSquare.html U.S. Patent 50,608 was granted to a puzzle inventor in May. U.S. Patent 207,124 was granted to another puzzle inventor. U.S. Patent 284,037 was also granted to a puzzle inventor named McCleary. Brown's patent number is 390,829. Bradshaw holds U.S. Patent 427,392. Brown has a patent number of 433,444. Cook's patent number is 476,980. Anderson holds patent number 483,276. Eymann's patent number is 535,279. Johnson's patent number is 1,555,980. Fritz holds U.S. Patent 1,693,711. Nesis has a patent number of 5,785,318.