How to Start Click or tap on the Start button to mix up the pieces. The aim is to get them back in order by clicking / tapping on the numbers to slide them into the empty box. There is no target, as different shuffles need a different number of moves, but generally under 100 moves is a good score. Hint You can slide more than one piece at a time by clicking / tapping numbers further away from the empty box. History This is the original Fifteen slide puzzle invented around 1878 and first marketed in Boston in 1880 as the ‘Gem Puzzle’. Later re-invented by Sam Loyd Senior (1841-1911) as the unsolvable ‘14-15 Puzzle’. It is also called ‘Jeu de Taquin’ or ‘Teasing Game’ in France. Loyd turned it into an impossible puzzle by making it with the 14 and 15 pieces swapped. The $1000 prize he offered for its solution was of course never won!
