X-Sudoku
Classic Sudoku with an additional diagonal constraint.
Objective
Follow all classic Sudoku rules, plus both main diagonals (top-left to bottom-right and top-right to bottom-left) must also contain digits 1-9 without repetition. This adds an extra layer of complexity to the classic puzzle.
Rules
Row Rule
Same as Classic: Each horizontal row must contain all digits from 1 to 9 without repetition.
Column Rule
Same as Classic: Each vertical column must contain all digits from 1 to 9 without repetition.
Box Rule
Same as Classic: Each 3×3 box must contain all digits from 1 to 9 without repetition.
Diagonal Rule (NEW)
Both main diagonals must contain digits 1-9 without repetition. This creates additional constraints that make the puzzle more challenging.
Solving Tips
- 1.
Start with classic Sudoku techniques first - rows, columns, and boxes.
- 2.
Check both diagonals frequently as they add extra constraints that can help you solve faster.
- 3.
Numbers on the diagonals eliminate more possibilities in their row, column, box, AND diagonal.
- 4.
The center cell (row 5, column 5) is part of both diagonals and has the most constraints.
Ready to Try X-Sudoku?
Challenge yourself with diagonal constraints and test your advanced solving skills
