1. fill the grid so that the numbers 1 through 9 appear in each row. 2. fill the grid so that the numbers 1 through 9 appear in each column. 3. fill the grid so that the numbers 1 through 9 appear in each 3x3 box. 4. a complete sudoku puzzle contains the numbers 1 through 9 in every row, column, and 3x3 box. the same rules apply to monster mode!
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