# Sudoku X

## Sudoku X Online

Sudoku X is a twist on classic Sudoku. It follows the same rules of filling rows, columns, and 3x3 boxes with digits 1-9 without repetition. This brain-teasing puzzle is perfect for those who enjoy a mental challenge and want to improve their logical thinking skills. But what makes this version challenging to play? Sudoku X has two main diagonals of the grid that must also contain all the digits 1-9 without repeats.

## How To Play Killer Sudoku

To play Sudoku X, start by examining the partially filled grid. Use the existing numbers to deduce missing digits in rows, columns, and 3x3 boxes. It is just like regular Sudoku. You can use various techniques like scanning, marking up possibilities, and cross-hatching to help you find the right numbers. Crucially, remember the diagonal rule: each main diagonal must also contain all digits 1-9. Look for places where a number can only fit in one spot within a row, column, box, or diagonal. As you fill in numbers, more possibilities will open up, allowing you to progressively solve the puzzle.