# E-Sudoku

> E-Sudoku (https://e-sudoku.com) is a free online Sudoku website. Play classic 9x9 Sudoku across six difficulty levels, larger 12x12 and 16x16 grids, and Daily, Weekly and Monthly puzzles. Every puzzle is generated with a single unique solution, plays instantly in the browser with no download and no sign-up, and the site is available in 19 languages.

## Play Sudoku

- [All Sudoku variants](https://e-sudoku.com/sudoku): Hub page listing every playable variant.
- [Basic Sudoku](https://e-sudoku.com/sudoku/basic): Easiest 9x9 level for beginners and kids.
- [Easy Sudoku](https://e-sudoku.com/sudoku/easy): Relaxing 9x9 puzzles, a light brain workout.
- [Intermediate Sudoku](https://e-sudoku.com/sudoku/intermediate): Medium 9x9 puzzles needing real logic.
- [Advanced Sudoku](https://e-sudoku.com/sudoku/advanced): Hard 9x9 puzzles for experienced solvers.
- [Extreme Sudoku](https://e-sudoku.com/sudoku/extreme): Very hard 9x9 puzzles with minimal givens.
- [Evil Sudoku](https://e-sudoku.com/sudoku/evil): The hardest 9x9 puzzles on the site.
- [12x12 Sudoku](https://e-sudoku.com/sudoku/12x12): Larger 12x12 grid with 3x4 boxes and digits 1-12.
- [16x16 Sudoku](https://e-sudoku.com/sudoku/16x16): Giant 16x16 grid with 4x4 boxes and symbols 1-9 and A-G.

## Scheduled puzzles

- [Daily Sudoku](https://e-sudoku.com/sudoku/daily): A new 9x9 puzzle every day, the same for everyone.
- [Weekly Sudoku](https://e-sudoku.com/sudoku/weekly): A special harder puzzle each week.
- [Monthly Sudoku](https://e-sudoku.com/sudoku/monthly): A very hard special puzzle each month.

## Tools

- [Print Sudoku](https://e-sudoku.com/print-sudoku): Generate free printable Sudoku puzzles (PDF), choose difficulty and puzzles per page, with optional solutions.

## About

- [Home](https://e-sudoku.com/): Homepage with a playable board and variant links.
- [About Us](https://e-sudoku.com/about-us): About the E-Sudoku project.
- [Contact Us](https://e-sudoku.com/contact-us): How to reach the team (contact.esudoku@gmail.com).

## Optional

- [Privacy Policy](https://e-sudoku.com/privacy-policy)
- [Terms & Conditions](https://e-sudoku.com/terms-conditions)
- [Sitemap](https://e-sudoku.com/sitemap.xml): Full XML sitemap with all pages and 19-language hreflang alternates.

## Notes

- Languages: en, vi, id, ar, cs, de, es, fr, hu, it, ja, ko, ms, nl, pl, pt, ru, th, zh. Non-English pages use a locale prefix, e.g. https://e-sudoku.com/vi/sudoku/evil.
- Each variant page includes rules, how-to-play steps, solving strategies (scanning, hidden/naked singles, locked candidates, X-Wing, XY-Wing, Swordfish), tips, and an FAQ.
- All puzzles are free, ad-light, and require no account.