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Flip-flop classics Sudoku (798)
Instruction:
Fill in the grid with digits 1 to 9 so that every row, column and outlined box contains nine different digits.
There are two grids to be solved on two sides of the paper. There are 12 extra squares along the grid edge. You have to bend each of those extra squares (independently) to the one or the other side to form two classic sudokus of the standard size. You should solve them after that.