## Fifteen Puzzle

1. Put the squares back in numerical order by clicking on squares.
2. Clicking on any square that is in the same row or column with the
blank square will move every square between the selected square and
the blank square.

3. Clicking on any other square (or the blank square) will do
nothing.

4. The "Move for me" button will solve the puzzle one move at a time.
The strategy for the top two rows is fairly intuitive. The strategy
for the bottom two rows is not. The order used is: 13, 9, 14, 10, 11,
and 12/15.