To change the number of pieces in the puzzle or the shape of the pieces, click on the "Shapes" button. There are several different sizes to choose, from 6 to 247 pieces, and many different shapes, including polygons, zigzag, circles, and more!
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If puzzle pieces get hidden behind the puzzle as you are solving it, click on the "Shuffle" button to bring them to the top.
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To pause the clock, click on it. It will resume counting as soon as you start solving the puzzle again.