4D now introduces you the new and patented Scratch- Off : Seasons Puzzle of Big Ben. You first assemble the puzzle of London . Experience what the city looks like during the summer months. When complete, use the Scratch Off tool to begin scratching the top layer. As you Scratch, the summer image will disappear as if the seasons are changing before your eyes! Experience the winter months appear and the summer months fade away. But dont worry about the original summer puzzle image being scratched away. When scratching is complete, you can turn the puzzle over, and the original summer months re-appear! This patented Scratch Puzzle comes with a scratch tool and brush. Total Scratch time is an enjoyable 3-4 hours of fun as you perfect each piece, and see the seasons change before your eyes. The puzzle measures 24 x 18 with 500 pcs.