Clicking on a tile will move it, provided it is adjacent to the blank.
The puzzle was made famous by Sam Loyd in 1870 and has an interesting history.
At any time you may press the Reset button to display a new permutation of the tiles with the blank at the lower right. To see the parity of the current permutation, click the Parity button.
Resizing the screen may cause the puzzle to revert to its initial state. You can return to the current permutation by clicking the Repaint button.
Last major change: 19 April, 2000