Numbers & Math
SUDOKU X DIAGONAL
Sudoku X (Diagonal Sudoku) is a popular brain-twisting variation where both 9-cell main diagonals forming the giant X must also contain all numbers from 1 through 9 without duplication. Includes diagonal overlays, smart conflict alerts, and pencil notes.
🎮 Desktop Controls
Click with mouse or use Arrow / WASD keys depending on the puzzle engine.
📱 Mobile & Tablet
Intuitive responsive touch controls with large tap targets and virtual buttons.
❓ Frequently Asked Questions
Q1: What makes Sudoku X unique?
In addition to regular rows, columns, and 3x3 boxes, the two major diagonal lines intersecting the center of the board must also contain digits 1 through 9 without repeating.
Q2: How can I tell which cells are on the diagonals?
Diagonal cells are shaded in a distinct amber tint with an 'X' diagonal highlight.
Q3: Can I use pencil notes in Sudoku X?
Yes! Toggle the Notes button to pencil in candidate numbers for tricky diagonal intersections.
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