![]() Process of Elimination: Use the process of elimination to determine where numbers cannot go, thereby identifying where they can go.Check for Constraints: Ensure that the placement of a number doesn’t violate the basic Sudoku rules. Immerse yourself in the joy of solving sudoku on paper, away from screens.Look for Certainties: Always place numbers that are certain first and then work on the probable ones. Compatible with all browsers, tablets and phones including iPhone, iPad and Android.Use Pencil Marks: Employ pencil marks to keep track of possible numbers for each cell.Avoid Repetition: Pay attention to avoid repeating numbers in each row, column, and irregular area.Unique Numbers: Ensure every row, column, and irregular area has unique numbers from 1-9.Each of these areas must also contain the numbers 1 through 9 with no repetition. Irregular Areas: Unlike classic Sudoku, the 9x9 grid is divided into several irregularly shaped areas. ![]() No Repetition: Each row, column, and outlined area must contain no repeated numbers from 1 to 9.Numbers: You must fill each cell of the grid with numbers from 1 to 9. ![]() The difference between a Sudoku and an X-Sudoku is that each of the two main diagonals of an X-Sudoku can contain the numbers from 1 to 9 only once too. Numbers inside a cage, when added together, should make a number shown in the upper left corner of that cage. An X-Sudoku is solved just like a classic Sudoku by filling the numbers from 1 to 9 into the blank cells. Don’t repeat the same number within a row, column, 3x3 block or a cage, indicated by a dotted line.
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