Each set contains 10, 6”, two-sided puzzles. One side of the puzzle contains basic math facts, and the other side has a photograph. Each puzzle has its own clear plastic tray and lid.  Math facts are solved in the bottom tray (the answers are all the shame shape). The lid is closed and the puzzle is turned over. If the photo is jumbled, the math facts have not been completed correctly. Launch date: September 2007.