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15 puzzle
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== Pop culture == [[World Chess Championship|Chess world champion]] [[Bobby Fischer]] was an expert at solving the 15 puzzle.<ref>Clifford A. Pickover, ''The Math Book: From Pythagoras to the 57th Dimension, 250 Milestones in the History of Mathematics'', p. 262, Sterling Publishing, 2009 {{ISBN|1402757964}}.</ref> He had been timed to be able to solve it within 25 seconds; Fischer demonstrated this on [[List of The Tonight Show Starring Johnny Carson episodes (1972)#November|November 8, 1972]], on ''[[The Tonight Show Starring Johnny Carson]]''.<ref>[https://www.youtube.com/watch?v=QxvnEwvgfeI "Bobby Fischer solves a 15 puzzle in 17 seconds on Carson Tonight Show - 11/08/1972"], ''The Tonight Show'', 8 November 1972, Johnny Carson Productions, retrieved 1 August 2021.</ref><ref>Adam Spencer, ''Adam Spencer's Big Book of Numbers: Everything you wanted to know about the numbers 1 to 100'', p. 58, Brio Books, 2014 {{ISBN|192113433X}}.</ref>
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