Scan: Continuously scan rows, columns, and regions to make sure that the basic and additional rules are being adhered to.Number of medium sudoku grids 1 2 4 8 12. A new medium sudoku every minute Choose your level and print your sudoku, you can create you own sudoku book up to 12 pages. All of these puzzles are in PDF format, which you can print for free. Free medium printable Sudokus provides free sudokus. Each of the nine rows and columns, as well as each of the nine subregions, must contain one and only one of each of the nine letters. Double Pairs: If two cells in a row, column, or region can only be two numbers (like 3 and 4), exclude these numbers from other cells in that area. These are played just like a regular sudoku, except that each of the digits is replaced by a unique letter.Exclusion: If a number is already present in a row or column, look for other places in the respective region to place the remaining numbers.
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