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2019-Aug-17: Volumes 19 and 20 of Killer Sudoku are out. Enjoy!

Challenging Jigsaw Sudoku, Volume 1

Each booklet contains a collection of eight different puzzles, 1-per-page, with a page of hints and a page of answers in the back. The booklets are ordered by ascending difficulty -- the puzzles in book 100 are much harder than the puzzles in book 1. All these puzzles have a single unique solution.

These puzzles are in PDF format and can be printed in your web browser or with a standalone PDF reader.

You can also download all 800 of these puzzles, in the 4-per-page format ( with hints and answers, with answers but no hints, or with neither hints nor answers).

Want to save some trees? Try the online version of these puzzles.

Problems printing puzzles? Try these work-arounds.

Out of challenging puzzles? Here's 800 more!.