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Name: Wooden Sphere Puzzle. Please note the size: 2.36 x 2.36 x 2.36 (inch) Children should be used under adult supervision. It is a puzzle that will entertain and challenge all of yours Hard to take it apart, but harder to assemble. When assembling requires careful observation and thinking, analyze its internal structure.Our mind puzzle help to exercise brain, develop intelligence, improve problem-solving ability, and also relieve pressure Tips: paper instructions and video link QR code is prepared, but in order to make it challenging and fun, we suggest you try your best to unlock this wooden ball puzzle without instruction