The giant 24 piece jigsaw puzzle is bright and colorful and has extra-large pieces, which is great for small hands, and on every jigsaw piece is a number from 1 - 24. Once the puzzle has been completed, children can keep the puzzle in a safe place, perhaps on their bedroom table, and look forward to revisiting it every day in December. Or use it as an ordinary jigsaw throughout the year, assembling and breaking it up., , Why is this puzzle an advent jigsaw? On every jigsaw piece is a picture window that children can lift up when it is that particular day in December, and reveal a fun and festive Fireman Sam illustration behind it - even more fun than a traditional jigsaw puzzle. The completed jigsaw puzzle will show Fireman Sam and his friends driving Venus through the snow, with friends from Pontypandy watching them go past. But the images behind the picture windows are completely different, making it more of a surprise.