Sudoku with a voice that knows when to stay quiet.
A hint when you want one — and none when you don't.
Every puzzle carries its own Sudo Codes & Sudo Hints
— and a name that is never recycled.
Free samples and book news. No noise — we whisper here, too.
What makes these puzzles different
Most books shout the answer or say nothing at all. Ours whisper — exactly as much as you ask for.
Sudo Codes
Every solution has a name — a short string of real words printed right on the page. Type it into the decoder and the full solution blooms back. No two puzzles ever share one.
Every name is pre-determined,
not random. (over 6.6 sextillion names from over 5.4 billion families)
Dot Hints
Below the puzzle sits a small hint grid that speaks only in dots. Where a dot sits inside its cell encodes that cell's digit — through a key printed beside it. Decode one cell when you want it; the rest stay silent.
(9-position tiny dot alphabet)
Word Hints
The same hint grid, speaking in words instead — our USA edition hints with the fifty states. One word, one lookup, one cell. No spoilers.
Honestly graded
Every puzzle is machine-rated for difficulty before it's printed, so the number on the page means the same thing in every book, every time.
Free sample puzzles
Print them, solve them, try the hints. Each comes in two flavors — dot hints or word hints — same puzzle, your choice of whisper. The PDFs below are the same ones used in our Sudo Demos.
The Decoder
Found a Sudo Code on one of our pages? Type it into the decoder and the full solution blooms back — all 81 digits, from a handful of ordinary words. (Try one from a free sample. Or click our logo and let a puzzle whisper you one.)
Sudo Demos
Play one of our pages right in your browser — the exact printed sheet, dot hints, scrambled key, Sudo Code and all. Enter digits, check your page, and when you want the real thing, print the PDF it mirrors.
The books
The Sudoku Whisperer series is coming to Amazon — print books where every puzzle carries the full hint system. Volume 1 introduces the Precision Hint System across a real range of difficulty.