Brains Cube - 3x3x3 Brain cube with solving key; easy rotation and smooth play cube puzzle in vibrant colors for kids Puzzle amazement: This amazing smooth cube puzzle is easy to use with single-finger turns and reverses cornering with pop-resistant pieces Preschoolers get challenged during playtime and love to adjust cubes in perfect order to solve the puzzle Mental power: Kids learn perfect eye-muscle coordination and enhance memory acumen to beat their own personal time or compete between each other Vibrant: Vibrant colors on each side are attractive and use resistant