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Oct-16: My friend Heather and I have started a Kickstarter to produce a neat hands-on puzzle kit for kids.


The puzzles, based on Suguru, are called Pixidoku. They use cute emoji tiles instead of numbers.


Check out the Kickstarter page for more information!

Challenging Killer Sudoku, Volume 14

Each booklet contains a collection of eight different puzzles, 1-per-page, with 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 need the Adobe Acrobat Reader to view or print.

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 even more trees? Try the online version of these puzzles.

Here's a handy cheat-sheet of candidate cage sets that makes it easier to eliminate numbers.

Problems printing puzzles? Try these work-arounds.

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