KINGOU IQ Challenge Set Logic Wooden Puzzles High Difficulty Brain Teaser Toys Set 6 Packed, Adult/Kids 6 Pack 3D Wooden Puzzles Set Easy to take apart when you get the point, but very hard to assemble. Are you dare to challenge? Difficulty Rated: Note: to make it challenge and fun, parcel without paper instructions. We will send emails for you to tell the secret solution. If you need help, please contact us. Ideal toys for friends gathering game, family interaction, reduced pressure and relax after work and so on. Fit for adult and age 5 & up children. These mental puzzle toys will challenge your intellect by stimulating amazing creativity. It requires careful observation and thinking, analyze its internal structure when assembling. Our mind puzzle help to exercise brain, develop intelligence, improve problem-solving ability.