The MindWare Gearjits Marble Coaster is a 3D wooden puzzle with 236 pieces. It features a beautiful architecture theme and is made of high-quality wood. This puzzle is recommended for ages 12 and up and is perfect for both 12-16 years and 17 years & up. The puzzle pieces are interlocking and fit together to form a coaster that can be used with marbles. The puzzle is designed to challenge the mind and improve spatial skills.