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…