The satisfaction of completing a Puzz 3D is a beautiful thing. I am addicted to the puzzles now. It all started with a .69 cent one I found at Salvation Army now I have spent over $300.00 in the past month trying to create a skyline to fill my room. Some of the puzzles are Rare and others are Extremly Rare such as Taipei 101, Petronas towers, The CN Tower  and city scapes like New York, which has over 3000 pieces. Ebay is the best source I have come across to find Puzz 3d's of all kind. There are also Star Wars, Lord of the Rings, & Haunted Houses. There are puzzles with working Lights, Clocks, and Glow in the Dark Features