Play a JavaScript version of the 15 puzzle, a sliding puzzle where you must rearrange the 15 numbered square tiles in the 4x4 frame to be in ascending order, going from 1 to 15 from left to right, top to bottom, leaving a hole in the bottom-right corner.
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More about the 15 puzzle: the 15 puzzle was NOT invented by Sam Loyd, although he claimed that he did. Instead, it is thought that a postmaster from New York named Noyes Palmer Chapman first created the puzzle, some time around 1874. The puzzle had become a craze by 1880, helped by Sam Loyd's offering of $1,000 to anyone who could solve his configuration of the 15 puzzle. Little did people know at the time that his configuration of the puzzle was impossible to solve! Noyes Chapman tried to patent the 15 puzzle, but was unsuccessful.
Variants of this puzzle include larger and smaller versions, as well as versions that use a scrambled image instead of a scrambled set of numbers.