15 Puzzle

Il 15-puzzle è un gioco che consiste nel far scorrere alcune tessere quadrate numerate.

The 15 puzzle was "invented" by Noyes Palmer Chapman, a postmaster in Canastota, New York, who is said to have shown friends, as early as 1874, a precursor puzzle consisting of 16 numbered blocks that were to be put together in rows of four, each summing to 34. Copies of the improved Fifteen Puzzle made their way to Syracuse, New York by way of Frank, son of Noyes, and from there, via sundry connections, to Watch Hill, RI, and finally to Hartford (Connecticut), where students in the American School for the Deaf started manufacturing the puzzle and, by December 1879, selling them both locally and in Boston, Massachusetts. Shown one of these, Matthias Rice, who ran a fancy woodworking business in Boston, started manufacturing the puzzle sometime in December 1879 and convinced a Yankee Notions fancy goods dealer to sell them under the name of "Gem Puzzle". In late-January 1880, Dr. Charles Pevey, a dentist in Worcester, Massachusetts, garnered some attention by offering a cash reward for a solution to the Fifteen Puzzle.

HOW TO PLAY :

You will be given a board of 4x4 cells out of which one tile will be missing. Your aim is to arrange the tiles in correct numerical order. Touch on any tile to move it to the blank space on grid. To be a maestro you have to complete the game in minimal time and moves