Tough Killer Sudoku, 4-per-page, Volume 7

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 can be viewed/printed from any modern web browser.

Want to save even more trees? Solve the puzzles right here, in your browser.

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

Download all 800 puzzles and save some time! (4-per-page format):

• 👉 with hints and answers
• 👉 with answers but no hints
• 👉 with neither hints nor answers

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