This is the first time I have seen the back of the puzzle with a design (those lines of "A A A A A" or "E E E E ". I am thinking that could help for when we put out puzzles at the school library. Often the kids will place a piece that is not really a fit and we don't notice it, With the lettering, I think you could lift a few pieces and check to be sure the piece was in the right place. The fit of the pieces works well and the sturdiness of the cardboard is fine.
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