Jigoku (translated as "Hell" in Japanese) is a variation of the popular Sudoku puzzle. Once again, you are given a 9x9 square grid which you must fill with numbers from 1 to 9, so that no number repeats in a row, column or outlined 3x3 square. However, in Jigoku no hint numbers in the grid are shown. Instead you are given the value comparisons (bigger/smaller) of the numbers in the neighboring cells.
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