Crystal Puzzles challenge the mind and delight the eye with their intriguing shapes, bright and dark colours, and even a little bit of glitter here and there. And once they're assembled, they're the sort of thing that you won't mind displaying somewhere in your home. This 3D crystal puzzles will tease your brain and delight your eye. The uniquely-shaped plastic interlocking pieces combine to make a nice decoration for any room. But don't be fooled. These puzzles are harder than they seem.