MATERIAL: Birch SIZE: 4.25" iDventure ClueBoxes are challenging interactive puzzle boxes. Each box is locked by sequential mechanisms, which must be solved in a particular order. Solutions require logical thought rather than random tricks, and each box is jam-packed with different ideas. Captain Nemos Nautilus is the most recent and complex Cluebox. It consists of 52 individual parts precisely cut from high-quality birch wood and sealed with an oil finish. Playtime is estimated at 60-90 minutes. Once the box is solved, the internal space measures 1.6" x 0.8" x 0.8". Captain Nemos Nautilus is shipped unsolved, with an informative insert that provides a URL for hints should you need them. This puzzle is one of three iDventure ClueBoxes we carry. You may also be interested in Davy Jones' Locker and Schrodinger's Cat . We offer a bundle discount for the purchase of all three; enter the following code during checkout to apply to your order: Cluebox Bundle