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Twist the fingertips to rotate the four overlapping discs of wedges.
Also known as the Handy Triad, this is the little brother to the "Mad Triad Challenge".
Also known as "Twisting Tri-Side Puzzle" in the UK.
Twist a fingertip and one of the rings of six wedges will rotate, scrambling the puzzle. It's fairly easy to solve, and also to make interesting patterns such as stripes.
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