X-Sudoku Puzzles (Diagonals)

About X-Sudoku Puzzles

X-Sudoku, also known as "Diagonal Sudoku", is a fun variation of the classic Sudoku puzzle. It follows all the standard Sudoku rules: each row, each column, and each 3×3 box must contain the numbers 1 through 9 exactly once. In addition, both main diagonals of the grid must also contain every number from 1 to 9 without repetition.

This extra rule increases the challenge and requires more advanced solving strategies, making X-Sudoku a favorite among puzzle enthusiasts looking for something beyond traditional Sudoku.

Basic Rules / How to Play

• Grid Size: The puzzle has typically 9x9 grid size made up of three 3x3 sub-grids.
• Rows: Each row must contain all digits from 1 to 9. No digit can be repeated within a single row.
• Columns: Each column must contain all digits from 1 to 9. No digit can be repeated within a single column.
• Box: Each 3×3 box must contain all digits from 1 to 9. No digit can be repeated within any of the nine 3×3 subgrids.
• Pre-Filled Numbers: The numbers given at the start of the puzzle must remain unchanged.
• Diagonal Requirement: Besides the usual rules, both of the main diagonals in the grid must also have all the numbers from 1 to 9, with no repeats.

Need Help?

To get started, check out these instructions, goals and rules for how to solve Sudoku

Example:

Puzzle	Solution