Everyone knows what 2D puzzles are, we have all assembled some. Then came 3D puzzles with multiple layers. Now here are 4D puzzles which concentrate on cities and include elements from a cities past, present, and future. Have fun and learn something new about the famous cities of the world, like New York, London,Chicago, Washington, Hong Kong, Paris, Dubai and many more. It is a great educational and fun tool because you will learn how a city develops and evolves,you will explore historic buildings and architectural styles, get to know the geography and much more. The puzzles are so unique and great that they were awarded the Gift of the Year 1st Place Prize when they came out just 3 years ago .