About Sudoku0

Sudoku0 is built around a simple promise: open the site, start thinking, and keep your progress without creating an account.

Certified puzzles

Published grids are created by Sudoku0 tooling and checked for valid givens, a complete solution, exactly one solution, stable metadata, and duplicate fingerprints before release.

Hints that explain first

Sudoku0 previews a supported strategy before changing the board. When a logical single is not available, the interface clearly identifies a solution-backed guided reveal.

Local-first play

Current games, preferences, completion history, streaks, and best times stay in your browser. No account or gameplay database is required.