Description
120 fiendish Sudoku puzzles that go beyond every textbook technique.
Fill the grid so every row, every column and every 3 × 3 box holds the numbers 1 to 9 exactly once. Each puzzle has one solution, and it can be found by logic alone.
Every puzzle in Fiendish Sudoku is rated Fiendish, which means it needs more than every technique in Expert: chains, colouring or a careful trial. None of these can be finished with the textbook techniques up to X-Wing. They are the hardest classic puzzles Ninebloom makes.
What’s inside Fiendish Sudoku
- 120 classic Sudoku puzzles, two to a page, each with a started/finished box
- A QR code beside every puzzle that opens it in Ninebloom with step-by-step hints
- How to play, and what each level needs, technique by technique
- Every solution at the back, starting numbers in bold
- A page about Ninebloom, the free Sudoku app the puzzles come from
Stuck? Play it in Ninebloom
These puzzles were made and checked by Ninebloom, our Sudoku app for Android, and rated the same way: by the techniques a puzzle needs, not by how many numbers are missing. Every classic puzzle in the books has a small QR code beside it; scan it and the same puzzle opens in the app, where a hint names the technique that cracks the next square and shows you why. Get Ninebloom on Google Play (free, no account needed) or read more at ninebloom.leafyorb.com.
Specifications
| Puzzles | 120 classic Sudoku, two to a page (120 fiendish) |
|---|---|
| Pages | 86: how to play, 60 puzzle pages, 20 pages of solutions |
| Grid size | A 4-inch (10 cm) grid with squares big enough for pencil marks |
| Rating | By technique, with Ninebloom’s solver: every puzzle has exactly one solution |
| Solutions | All of them, six to a page at the back |
| Page sizes | US Letter (8.5 × 11 in) and A4 (210 × 297 mm), as separate PDFs |
| Files | 2 PDFs — Letter 1 MB · A4 1 MB |
| Delivery | Instant download; links work for 90 days and 5 downloads per file |
| License | Personal use — print as many copies as you like for yourself, your family or your classroom |
Who it’s for
Beyond the textbook: bring patience. Print a few pages for the train, the waiting room or the kitchen table, or print the whole book and keep it in a folder. Because it’s a download you can print a favourite puzzle twice and race someone, or give the printed pages as a gift.
More from The Ninebloom Sudoku Collection
Fiendish Sudoku is book 6 of volume 1 of The Ninebloom Sudoku Collection: six levels of classic Sudoku and four variants. It’s also part of The Sudoku Challenge Trio, Volume 1 (three books for $11.99), and of The Complete Ninebloom Sudoku Set, Volume 1, all ten books for $29.99. Not sure yet? Print the free sampler: one puzzle from every book, with the solutions.
More like this: our printable sudoku puzzles, and jumbo word searches.
Good to know
- It’s a digital download: PDF files, no physical book is posted.
- Your links appear on the confirmation page and by email, and work for 90 days and 5 downloads per file.
- Personal use: print as many copies as you like for yourself, your family or your own classroom. Please don’t share or resell the files or printed pages.
- If a file won’t download or print properly, email littlepageshop@leafyorb.com and we’ll fix it or refund you.
Paper and printer settings are in our printing guide; everything else is in the FAQ.
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