Nonalys

Nonalys is a Sudoku you can always finish by thinking. Every puzzle has exactly one solution, and that solution is reachable by logic alone — there is never a point where you have to guess. The difficulty label is not a mood: it names the hardest technique the puzzle actually requires. FIVE LEVELS, EACH ONE A PROMISE - Easy: up to hidden singles. - Medium: up to locked candidates and pairs. - Hard: up to naked and hidden triples. - Expert: up to the X-Wing. - Master: up to colouring and the wings. HINTS THAT EXPLAIN INSTEAD OF SOLVING A hint arrives in four steps, and you stop wherever you have had enough: where to look, which technique applies, which cells form the pattern, and only then the move itself. Every step is written out in words — "in box 4, 7 fits in only one cell" — so a hint leaves you able to find the next one yourself. A LEARN TAB, NOT A PAYWALL Eighteen techniques, from the naked single to simple colouring, each with a written explanation of how to spot it and a worked example on a real grid that highlights the pattern and what it rules out. They are grouped by the difficulty that first needs them. A BOARD THAT DOES NOT FIGHT YOU - Pencil marks: fill them automatically or by hand, clean them up on entry, long-press a digit to write it as a mark. - Cell-first or digit-first entry, whichever way your hands work. - Undo and redo, erase, and a pause that hides the board and stops the clock. - Optional highlighting of the row, column and box, of the same digit, and of conflicts. - Optional mistake checking — off, on entry, or only when you ask. - Remaining counts per digit, an optional timer, and an option to keep the screen on while you solve. - Your game is saved as you go, so you can leave mid-puzzle and come back to it. STATISTICS THAT STAY ON YOUR DEVICE Per level: games played and completed, completion rate, best and average time, current and best streak, hints used and mistakes made. Plus overall totals and a daily streak. Clear it all whenever you want. NOTHING HELD BACK, NOTHING WATCHING - One purchase. No ads, no subscriptions, no in-app purchases, nothing to unlock. - Works completely offline. No account, no sign-up, no network requests at all. - No analytics, no tracking. Nothing leaves your device. - Light and dark themes, both included. - English, Portuguese, Spanish, German, French and Japanese — board, hints and all. - Built for VoiceOver and TalkBack, with Dynamic Type and reduced-motion support. Questions or bug reports: see the support link on this page.