KINGOU Chinese 3D Wooden Inside Story Puzzle Interlocked Burr Puzzles Disentanglement Magic Cube Name: Story Inside Wooden Puzzle. Size: 2.56 x 2.56 x 2 inch. Recommended for ages 8 & up, children should be used under adult supervision. It is a puzzle that will entertain and challenge all ages. Hard to take it apart, but very difficult to assemble. Will you flinch? Difficulty Rated: . When assembling requires careful observation and thinking, analyze its internal structure.The interlocking puzzle help to exercise brain, develop intelligence and spatial awareness, improve problem-solving ability, and also relieve pressure. To make it challenging and fun, parcel without paper instructions, We will send emails for you to tell the secret solution. If you need help, please contact us.