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15 puzzle

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The board is almost completely ordered - only the 14 and 15 pieces switched their positions. Can you change them back where you are only allowed to slide pieces into the empty place?
Use arrows to "move" the missing piece. You can also switch any two pieces by clicking them one after the other (these are not legal moves). Control click to hide\show the game piece. In the challenge mode you get a solvable board and you can only use legal moves (using the arrows).
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