Divided in 4 patterns on the back board
We print hint patterns on reverse to help you complete very difficult puzzles. Four kinds of marks "●", "+", "♥", and "★" are printed in each quadrant of the puzzle. (See the figure).
If you get stuck, you can refer to the patterns on the back as a hint to the correct quadrant. If you don’t look at the back, you can enjoy it as a normal jigsaw puzzle.
Note: Available for some 1000 piece puzzles only.