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A unique math puzzle!

Place the number buttons randomly on the ball, then position the tiles to that the number of dots encircling the button match the button's number. This puzzle can be solved every time, regardless of how the number buttons are arranged.

This is a nice BIG puzzle and feels great to hold in your hands. The ball is about 4.75 inches in diameter.

Difficulty: about 3-4 out of 5.