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Play Sudoku Online. Free sudoku in 4 levels of difficulty. Sudoku means 'Number Place'. It is made of 9 rows, 9 columns and 9 blocks. The goal is to place the numbers 1 to 9 in each row, column and block (a subgrid of 3x3 cells). Each of the nine blocks has to contain the numbers 1 to 9 in its squares. Each number can only appear once column ... dlu login