Printable X-Sudoku (diagonal sudoku)

X-Sudoku, also called diagonal sudoku, has the classic rules plus one: both long diagonals of the grid must also contain every number from 1 to 9, with no repeats. The diagonals are shaded, so you can see them at a glance.

The extra rule helps as much as it complicates: the center cell sits on both diagonals, and diagonal cells have more neighbours to check. That is often the best place to start.

You will find easy puzzles, solvable with singles, and medium ones that need a little more technique. Every PDF has the solution on page 2.

The puzzles

• X-Sudoku #1easy · 32 clues
• X-Sudoku #2easy · 32 clues
• X-Sudoku #3medium · 30 clues
• X-Sudoku #4medium · 29 clues

Useful techniques

• Hidden single
• Locked candidates
• Hidden pair

Want several puzzles on one page? The printable sudoku generator builds an A4 sheet with several puzzles, the rules and the answers (the page opens in Italian; pick English from its language menu).