Sudoku challenge numbers from 1 to 9 are inserted into sets that have 9x9=81 squares in total. each number can be used only once in a column and a row. each number can be used only once in the blocks of 3x3=9 square blocks. to solve the puzzle, you need to fill in the table so that every row, column and block of squares, each consisting of 9 entries, include all numbers from 1 to 9, no number is replicated or omitted. some numbers will already be inserted in the puzzle. the higher number of pre-inserted squares indicates a lower level of difficulty. solving a sudoku puzzle can take, depending on the difficulty level, between 20 minutes and 2 hours.
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