Printable puzzle book
Killer Sudoku puzzle book, one hundred grids on paper.
One hundred Killer Sudoku puzzles in one book, generated and checked by program, laid out to be printed and solved with a pencil. The book is called Badgers, it runs to 108 pages, and it comes as two PDFs, one sized for A4 and one for US Letter.
- 100 puzzles: 25 easy, 30 medium, 30 hard, 15 challenge, in that order
- 108 pages, A4 and US Letter both included, solutions at the back
- nothing given at the start, and still exactly one solution each
A real page out of the book, exactly as it prints. Tap it for the free five puzzle sample.
for the Badgers book, both page sizes, VAT included. All ten books together are 19.90 €, which saves 29.10 € against buying them one by one.
Buy Badgers for 4.90 € All ten for 19.90 €The buy button takes you to the shelf page, where the payment and the download live. Seller: ARLing s. r. o., Company ID 56583486, Bratislava. Stripe is merchant of record and issues the receipt. Terms and Withdrawal.
What is inside
One hundred grids, in order of difficulty.
The book holds one hundred Killer Sudoku puzzles and nothing else: 25 easy, 30 medium, 30 hard and 15 challenge, arranged so that difficulty rises through the book without a jump in the middle. The grids grow with it, from smaller ones at the front to the full sized challenge ones at the end.
In front of the puzzles are the rules with one worked example, so the book stands on its own without this page. At the back are the solutions to all one hundred, numbered to match.
You get two PDF files: one laid out for A4 and one for US Letter, 108 pages each, the same puzzles in both. Black and white, fonts embedded, vector line work, with the dotted cage outlines drawn so that they survive a home printer and the cage totals stay out of the way of pencil marks.
The rules
Three rules, printed in the front of the book.
- Every row, every column and every block holds each number once. A block is the small rectangle marked by the thicker line.
- The dotted cages add up. A cage is the group of cells inside one dotted outline, and the small number in its top left corner is what its cells add up to, with no number repeated inside the cage.
- Nothing is filled in at the start: the cages are the whole puzzle, and exactly one arrangement fits.
One solution
Hard to see, not hard to guess.
A puzzle book can say unique solution and mean that somebody checked the answer once. We mean something narrower. Each puzzle is built by a program that also solves it, and the solver is asked to find two solutions; the puzzle is kept only if it finds exactly one, and only if it reached that one by applying rules rather than by writing a digit to see what happens.
With no starting numbers at all, that check is the only thing standing between a fair puzzle and one that needs a computer. Every grid in this book can be reasoned out from the cages alone.
Two more things the program checks before the book is printed: no two puzzles are the same, and no two have the same answer. The program also re-derives every cage total from the printed answer and compares it with the printed puzzle.
Before you pay
Look at it first.
- Free sample, five puzzles (PDF)
Taken from all four difficulty levels, so you can see the hard end before you decide. No account, no e-mail.
- Play a Killer Sudoku free today
A new one every midnight in the browser, with hints that explain themselves. The book holds different puzzles from the daily ones.
- All ten books on one page
Ten kinds of logic puzzle, 1000 puzzles in all, 19.90 € for the lot.
Questions
Before you pay.
What exactly do I get?
Two PDF files: one laid out for A4 and one for US Letter, 108 pages each. The puzzles are the same in both, only the page size differs. Both are black and white with the fonts embedded, there is no DRM and no account, and the files are yours to keep and print as often as you like.
Are any numbers given at the start?
No, none. That is what makes it Killer Sudoku rather than Sudoku with sums added: the cages and their totals are the entire clue. It is also why the uniqueness check matters so much, and why the book prints the rules with a worked example in the front.
How do I print it?
On any home or office printer, in black and white. Choose the file that matches your paper and print at 100 percent or actual size rather than fit to page. The cells leave room for corner and centre pencil marks, which most Killer solvers use throughout.
How do you know every puzzle has one solution?
Because a program checked all one hundred. The solver is run with a limit of two solutions; if it finds a second one the puzzle is thrown away. It also has to reach the solution by rules alone, without trial and error. On top of that the program re-derives every cage total from the printed answer and compares it with the printed puzzle.
Can I get my money back?
By law, no, and we would rather say so before you pay. Digital content delivered immediately with your consent carries no right of withdrawal: in Slovakia that is section 19 paragraph 1 letter m) of Act No. 108/2024 Coll., across the EU Article 16 letter m) of Directive 2011/83/EU. The free sample exists precisely so you can decide first. If a file is broken or a puzzle is wrong, write to andrej@arling.sk.
Are these the same puzzles as the free daily game?
No. The book holds different puzzles from the daily ones, so nothing in it is a repeat. The free daily Killer Sudoku is at <a href="/games/badgers/">arling.sk/games/badgers</a> and the rules are identical.
Related
More to try.
Play Killer Sudoku free once a day in the browser: Killer Sudoku online.
All ten books, 1000 puzzles, 19.90 € together: ten puzzle books.