How to start
One of the simplest puzzles ever! As with the Fifteen puzzle, the aim is to rearrange the numbers back to the original layout
with the empty square in the bottom right corner where it started. Click on or tap a numbers to slide it into the empty square.
The target is 30 moves! How close can you get? Click on
Start to set up the puzzle.
Hint
Just to prove it’s not impossible, once you’ve given it your best shot, you can see the
answer in just 30 moves below.
History
I believe that this puzzle was devised by the English puzzlist, Henry Ernest Dudeney (1857-1930).
