X Sudoku puzzles by KrazyDad

Here are hundreds of free X Sudoku puzzles suitable for printing.

On this page you'll find five variants of Sudoku that all operate on a similar principle: These puzzles add extra 'houses' or 'containers', each of which contains all the numbers 1 through 9.

Each collection is ordered by difficulty, with the easiest puzzles in Book 1, and the hardest in Book 100. If you are new to these puzzles, I recommend you start with Book 1. If you find they are too easy, skip ahead by 10 books or so. If you find the puzzles are getting too hard, move up to Book #1 of the next volume, and they'll get easier again.

My puzzles are provided in 1-per-page format. You can use the formatting option on the download page to produce foldable booklets that conserve paper and ink.

SPECIAL THANKS to programmer Phil Bordelon, who helped program and debug these, and who came up with the CELLBLOCK variation.

• X Sudoku Puzzles

  The two main diagonals come into play.
  X Sudoku, Volume 1
  X Sudoku, Volume 2
  

• Jigsaw X Puzzles

  Irregular jigsaw-style pieces and diagonals.
  Jigsaw X, Volume 1
  Jigsaw X, Volume 2
  

• Center-Dot Puzzles

  Nine extra shaded squares
  Center-Dot, Volume 1
  Center-Dot, Volume 2
  

• Prisoner Puzzles

  This format was suggested to me by a prison-inmate in Colorado. It combines diagonals with center-dots.
  Prisoner, Volume 1
  Prisoner, Volume 2
  

• Cellblock Puzzles

  This format combines diagonals with 4 additional blocks, shown in grey. This format suggested by Phil Bordelon.
  Cellblock, Volume 1
  Cellblock, Volume 2
  

• Windsaw Puzzles

  This format combines windows with jigsaw shapes.
  Windsaw, Volume 1
  Windsaw, Volume 2
  

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Don't see the format you prefer? Run out of puzzles? Let me know!