It may take an infinite amount of time to solve this mind-boggling metal brainteaser by designer Doug Engel. Try to take the four nickel-plated pieces apart then fit them back together. 2-1/2" in diameter. Solution included.

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It may take an infinite amount of time to solve this mind-boggling metal brainteaser by designer Doug Engel. Try to take the four nickel-plated pieces apart then fit them back together. 2-1/2" in diameter. Solution included.

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