80 challenging puzzles of increasing difficulty for hours of brain-teasing fun. Develops spatial reasoning and problem-solving skills for players aged 8 to adult. Compact and portable design for on-the-go play, perfect for travel...or home. Set Includes: 1 transparent 3D cube, 13 colorful screws of different lengths, and 1 booklet with 80 challenges and solutions. Award-Winning: SmartGames is the worldwide leader in multi-level logic family games. Our award-winning games offer levels of play from easy to challenging, and we pride ourselves in making family board games that are perfect for players of all ages.