This amazing Yosegi puzzle has 8 sliding keys and requires 54 steps to unlock the secret space! Measures* 7.0 x 4.7 x 3.2 inch (18 x 12 x 8.2 cm) with an ins ide storage space size : 4.7 x 3.9 x 2.2 inch (12 x 10 x 5.6 cm). Includes solution sheet of how to open with a gift box!