X-Sudoku online

Types of challenge

Sudoku
Numbers
Regions

Skills you put into practice

Logical reasoningDeduce consequences and eliminate incompatible options.
Attention to detailTrack clues and detect conflicts on the board.
Working memoryHold several clues and constraints in mind while deciding.
Pattern recognitionIdentify regularities, symmetries and meaningful combinations.

A Sudoku where both main diagonals must also contain every number.

These puzzles engage different skills while you play. This does not in itself establish general cognitive improvement or replace professional care.

The challenge

A Sudoku where both main diagonals must also contain every number.

How to play

Follow the usual Sudoku rules.
Each of the two main diagonals must contain every number exactly once.

Advanced strategies

The two diagonals act as additional regions: check row, column, block and diagonal whenever a cell belongs to one.

History and background

We do not yet have a sufficiently verified account of this game’s origins. Rather than guess, we avoid attributing a date or creator without reliable evidence.

Tips and strategies

Before making a move, check what each rule rules out and avoid blocking options you may need later.

Frequently asked questions

Where should I begin? The two diagonals act as additional regions: check row, column, block and diagonal whenever a cell belongs to one.
What makes this game different? Each of the two main diagonals must contain every number exactly once.

X-Sudoku

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