KINGOU 3D Wooden Window Cube Lock Burr Puzzle Brain Teaser Puzzles Removing Assembling Toy Mission: Take it apart then assemble. Easy to take it apart, hard to assemble. Difficulty Rated:  . Size: 2.56 x 2.56 x 2.56 (inch) Recommended for ages 5 & up, children should be used under adult supervision, water-based paint, touch smooth. Great gift for kids, friends and elders, nice toy for entertainment and decoration on your table. To make it challenging and fun, parcel without paper instructions, if you need solutions, please contact us.