This Pearl in Shell 3D Crystal Puzzle may be challenging on the mind but it's easy on the eyes. It is a sleek, translucent, crystalline puzzle with 48 unique interlocking pieces. When you complete the moderately difficult puzzle you will have a flashy 3D crystal shell with a pearl inside to display or build again. Details: Black pearl in clear shell 48 pieces Difficulty level 2 For ages 12 and up