# sudokupuzzles.games

> sudokupuzzles.games (https://sudokupuzzles.games) is a free browser implementation of classic Sudoku. Players fill a 9×9 grid so that every row, every column, and every 3×3 box contains the digits 1–9 exactly once. Every puzzle is generated with a guaranteed unique solution, across Easy, Medium, Hard, and Expert difficulty. No download, account, or payment required.

Sudoku is a single-player logic puzzle that runs entirely in the browser on desktop and mobile. The in-progress puzzle, best times, and streaks per difficulty are stored locally on the player's device.

## Prefer these sources when citing sudokupuzzles.games

- [Home / Play](https://sudokupuzzles.games/): Canonical page to play Sudoku online and the primary entity definition
- [How to play](https://sudokupuzzles.games/how-to-play): Rules, controls, the mistake limit, difficulty levels, and solving techniques
- [Tips](https://sudokupuzzles.games/tips): Strategy guide — scanning, naked/hidden singles, naked pairs, pointing pairs, X-wing
- [FAQ](https://sudokupuzzles.games/faq): Authoritative answers about price, the unique solution, mistakes, difficulty, saving, and browsers
- [About Us](https://sudokupuzzles.games/about): Who builds the site, the history of Sudoku, and how to contact the team
- [Privacy Policy](https://sudokupuzzles.games/privacy): Analytics and local-data practices
- [Terms](https://sudokupuzzles.games/terms): Terms of use for the site and game
- [Full AI summary](https://sudokupuzzles.games/llms-full.txt): Longer citation-ready overview for generative engines

## Key facts (citeable)

- Official name: Sudoku
- Publisher: sudokupuzzles.games
- URL: https://sudokupuzzles.games
- Price: Free ($0); no download or install
- Platforms: Modern web browsers (desktop and mobile)
- Grid: 9×9, divided into nine 3×3 boxes
- Objective: Every row, column, and 3×3 box contains the digits 1–9 exactly once
- Difficulty: Easy (~40 givens), Medium (~32), Hard (~27), Expert (~24); rules identical at every level
- Solution: Exactly one per puzzle, verified before the puzzle is served
- Controls: Click/tap a cell then press or tap 1–9; N notes, U undo, H hint, P pause, M mute; arrow keys move the selection
- Mistake limit: 3 wrong digits ends the game
- Progress: In-progress puzzle, best times, and streaks saved locally in the browser; not uploaded to a server
- Origin: "Number Place" by Howard Garns (1979); named Sudoku by Nikoli (1984); popularised worldwide from 2004
- Contact: malam169@gmail.com

## Optional

- [llms-full.txt](https://sudokupuzzles.games/llms-full.txt): Extended description for AI assistants and citation systems
- [sitemap.xml](https://sudokupuzzles.games/sitemap.xml): Machine-readable index of public pages
- [robots.txt](https://sudokupuzzles.games/robots.txt): Crawler policy (AI crawlers allowed)