Samurai Sudoku also known as Gattai-5 is a more challenging sudoku-style puzzle featuring 5 overlapping sudoku grids. The rules of Samurai Sudoku are the same as an ordinary sudoku challenge, i.e. use the numbers 1 to 9 and place them into the puzzle grid in such a way that no number is repeated on any row, column or 9 square block.
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