15 puzzle
Videos
The 15 puzzle is a sliding puzzle. It has 15 square tiles numbered 1 to 15 in a frame that is 4 tile positions high and 4 tile positions wide, with one unoccupied position. Tiles in the same row or co
U.S. political cartoon about finding a Republican presidential candidate in 1880
Sam Loyd's 1914 illustration of the unsolvable variation
Sam Loyd
Videos
Samuel Loyd was an American chess player, chess composer, puzzle author, and recreational mathematician. Loyd was born in Philadelphia but raised in New York City.
15 puzzle
…not sufficiently different from the August 20, 1878 "Puzzle-Blocks" patent (US 207124) granted to Ernest U. Kinsey. From 1891 until his death in 1911, Sam Loyd claimed that he had invented the puzzle. However, Loyd had no connection to the invention or initial popularity of the puzzle. Loyd's first article…
Samuel Loyd