Killer Sudoku

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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 .

Early 2009, I read about KenKen (also known as Calcudoku ) in the New York Times, and decided to write a program that creates similar puzzles, and put them online. Calcudoku puzzles are similar to Sudoku, but also require some basic math skills to solve.