Sudoku Variants

X Sudoku (Diagonal Sudoku) Explained: How to Solve Diagonal Puzzles Step-by-Step

X Sudoku, also known as Diagonal Sudoku, is a delightful variant of the classic 9×9 grid puzzle. In addition to the regular Sudoku rules, X Sudoku introduces two main diagonals that must also contain the numbers 1 to 9 without repetition. This extra constraint adds a new layer of challenge and complexity to the puzzle. If you’re a Sudoku enthusiast looking to expand your horizons, mastering X Sudoku is an excellent choice. In this article, we will explain the rules and provide a step-by-step guide to solving Diagonal Sudoku puzzles.

Understanding X Sudoku Rules

X Sudoku is played on a 9×9 grid, similar to traditional Sudoku. The goal is to fill in the grid with numbers from 1 to 9, ensuring that each row, each column, and each of the nine 3×3 subgrids (referred to as “boxes”) contains all the numbers from 1 to 9 without repetition. Additionally, the main diagonals, from the top left to the bottom right and from the top right to the bottom left, must also have the numbers 1 to 9 without repetition.

Step-by-Step Guide to Solving X Sudoku

Step 1: Focus on the Diagonals

Since the diagonals have an added constraint, begin by looking for any numbers already given on the diagonals. Note down these numbers and consider the implications for other cells on the same diagonals. This will set the foundation for your solving process.

Step 2: Complete Rows and Columns

Next, concentrate on completing the rows and columns without worrying about the boxes or diagonals for now. Look for rows or columns with the most numbers already filled in, as they provide more clues to deduce the missing numbers.

Step 3: Work on the Boxes

Once the rows and columns have some numbers filled in, shift your focus to the boxes. Identify boxes with the fewest filled cells, as they offer more opportunities for deduction. Check the numbers already present in the corresponding rows, columns, and diagonals to find the right digits for the remaining cells.

Step 4: Use the Pencil Marking Technique

As with traditional Sudoku, make use of the pencil marking technique. Jot down potential numbers in empty cells, taking into account the constraints of rows, columns, boxes, and diagonals. Gradually eliminate candidates as you make progress.

Step 5: Look for Hidden Relationships

In X Sudoku, cells often belong to both diagonals and other units (rows, columns, and boxes) simultaneously. Be on the lookout for hidden relationships between these elements, as they can lead to valuable deductions.

Step 6: Apply Regular Sudoku Techniques

Many techniques used in regular Sudoku, such as naked pairs, naked triples, and pointing pairs, are also applicable in X Sudoku. Practice and master these techniques to handle complex situations effectively.

X Sudoku, or Diagonal Sudoku, adds an exciting twist to the classic Sudoku puzzle. By paying special attention to the diagonals and using a systematic approach to solving, you can tackle X Sudoku puzzles with confidence. Remember to utilize the pencil marking technique and be on the lookout for hidden relationships. With practice and perseverance, you’ll become adept at solving X Sudoku puzzles step-by-step. Enjoy the challenge and the satisfaction of conquering the diagonal puzzle!

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