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2018-Jan: I've done a lot of behind-the-scenes work on the website this month (including removing all the ads). If you notice something has stopped working, please let me know, and I'll try to attend to it quickly.
Thank you for your patience and help! — Jim

Killer Sudoku Puzzles

Killer Sudoku (also called Sum Sudoku) are a kind of hybrid puzzle that combine the best features of Sudoku and Kakuro (cross-sum) puzzles. Like a regular Sudoku, the rows, columns and 3x3 blocks contain the digits 1 thru 9. In addition, the dotted lines indicate areas, called cages, which also contain a set of non-repeating digits. If you add up the digits in a cage, you get the sum shown in its clue.

My Killer Sudoku puzzles are collected in 100 printable booklets per volume. Within each volume, the puzzles are also ordered by ascending difficulty (book 100 is harder than book 1, but book 1 volume 9 is about the same as book 1, volume 1). Each booklet contains eight puzzles, instructions, and answers.

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

Need a cheat sheet? Print out this one-sheet of candidate cage sets which makes it easier to eliminate numbers.

 

My new series of Killer Sudoku books, available in 4-per-page and Large Print 1-per-page formats, are now available on Amazon.

A variety of skill levels are available. Your purchase helps support this website!


Select a difficulty level:

How to use the hints

My puzzles contain a page of hints in addition to a page of answers.

The hints are puzzles grids that contain numbers showing the order in which the squares were solved by the computer. Although this is not necessarily the order you would solve the puzzle, it's probably pretty close.

Follow the numbered squares in order 1,2,3,4,5... until you find a square you haven't solved yet. This square (or the one or two immediately after it) is a good candidate to solve next.