3D Crystal Puzzle from University Games features uniquely-shaped, interlocking, see-through crystalline pieces that give puzzling a whole new dimension. Puzzles have 39 pieces and creates a small handheld 3D Minnie Mouse when complete. View the Instructions
I found it pretty difficult to get started, my first 3D puzzle. Love having it on my desk!
It didn't take me but a day but I love putting it together.