If you move some tiles around or shuffle again it will be able to solve from the new position. Hence once in every 23 times or so it won’t find a solution. To avoid an overly long pause, the search gives up after a reasonable amount of looking around. However, the time to finish an automated search can grow quite long in rare cases. There is always a solution for the shuffled position-the app generates only solvable ones. Just click the “Solve” button at the lower right and it will solve using a best-first algorithm. If you’re pressed for time, the app will solve the puzzle for you. The Shuffle button at the lower left shuffles the tiles en masse. If a tile isn’t on the same row or column as the empty spot, you can’t move it-just as with the physical puzzle. If the tile isn’t adjacent to the empty spot, the tiles in between move as well. When you click on (or touch) a tile, it moves itself toward the empty spot. Then the goal is to put them back in numeric order with 1 at the upper left. To try it out, click on the tiles to shuffle them up.
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