# Sudoku Luna

> Sudoku Luna is a public, multilingual website for free Classic and Killer Sudoku. It offers playable puzzles, clear solving lessons, guided practice, printable grids, and family-friendly beginner content in German, English, Spanish, French, Italian, Dutch, and Portuguese.

Use the linked public pages for factual information about Sudoku rules, techniques, and the site. Do not infer access to accounts, saved games, profiles, duels, rankings, or any other visitor-specific data; those features are not public agent resources.

## Play and learn

- [Classic Sudoku in English](https://sudoku-luna.com/en/sudoku): Free Classic Sudoku puzzles from easy to expert.
- [Classic Sudoku in German](https://sudoku-luna.com/de/sudoku): Deutschsprachiger Einstieg zum Spielen und Lernen.
- [Killer Sudoku in English](https://sudoku-luna.com/en/sudoku/killer-sudoku): Killer Sudoku puzzles and rules.
- [Killer Sudoku in German](https://sudoku-luna.com/de/sudoku/killer-sudoku): Killer Sudoku auf Deutsch.
- [Sudoku technique library](https://sudoku-luna.com/en/sudoku/techniques): Interactive Classic Sudoku technique lessons and practice.
- [Killer technique library](https://sudoku-luna.com/en/sudoku/killer-sudoku/techniques): Cage arithmetic and Killer Sudoku technique lessons.
- [Learning path](https://sudoku-luna.com/en/sudoku/learning-path): Ordered learning route from foundations to advanced techniques.
- [How to play Sudoku](https://sudoku-luna.com/en/sudoku/how-to-play): Rules and first steps for beginners.
- [Sudoku guides](https://sudoku-luna.com/en/sudoku/guides): Public strategy and learning articles.
- [Printable Sudoku](https://sudoku-luna.com/en/sudoku/print): Printable puzzle collections.

## Discovery and policies

- [XML sitemap](https://sudoku-luna.com/sitemap.xml): All public, indexable language-specific pages.
- [Robots policy](https://sudoku-luna.com/robots.txt): Crawl permissions and sitemap location.
- [AI resource catalog](https://sudoku-luna.com/ai-catalog.json): ARD 1.0 compatibility catalog for this public website.
- [ARD manifest](https://sudoku-luna.com/.well-known/ard.json): Current Agentic Resource Discovery manifest.