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2020-August-31: HAUNTED is our new spooky-cute puzzle, in which ghosts, vampires and zombies can be spied inside the corridors of a house of mirrors. A fun autumn activity for kids, teachers, and home-schoolers, you can learn more about it here!

Tough Sudoku Puzzles, 4-per-page, Volume 4

Each of my books contains a collection of eight sudoku puzzles, 4-per-page, with a page of hints and a page of answers in the back.

These booklets are in PDF format and need the Adobe Acrobat Reader to view or print.

Want to save some trees? Try my Interactive Sudoku, an online version of these puzzles that works on your browser or iPad.

Krazydad Sudokus are also available in a daily puzzle (for print or online).

Problems printing puzzles in Internet Explorer 9? Try these work-arounds.

Here's a blank sudoku grid in case you need to start over.

On the last book? Here's 800 more! (or try my Daily Puzzles)

Click here for the 1-per-page format.