# Puzzdoku

> Play free logic puzzles in your browser: Cat Sudoku, classic Sudoku and Kakuro. New daily puzzles, solver-verified unique solutions, hints and no sign-up.

Puzzdoku publishes free browser logic puzzles in the Sudoku family. Every puzzle has exactly one solution (verified by an exhaustive solver); Cat Sudoku boards are additionally verified to be solvable with human logic alone. No account or download is needed; progress is stored in the player's browser.

## Games

- **Cat Sudoku**: Place one cat in every row, column and color. Cats never touch. A cozy logic puzzle with cats instead of numbers. 50 levels plus a new daily board.
- **Sudoku**: Classic 9×9 Sudoku from easy to expert, plus a daily puzzle. Endless fresh puzzles in four difficulties, pencil marks, hints and a free solver.
- **Kakuro**: Cross-sums: fill each run with digits that add up to its clue. Number crosswords from 4×4 to 8×8 with candidate notes, explained hints and combination helpers.

## Cat Sudoku

- [Cat Sudoku](https://puzzdoku.com/cat-sudoku/): Play Cat Sudoku: one cat per row, column and color region; cats never touch.
- [Daily Cat Sudoku](https://puzzdoku.com/cat-sudoku/daily/): A new Cat Sudoku every day, 6×6 Monday to 9×9 weekend.
- [Cat Sudoku levels](https://puzzdoku.com/cat-sudoku/levels/): 50 levels from easy 5×5 to hard 9×9.
- [How to play Cat Sudoku](https://puzzdoku.com/cat-sudoku/how-to-play/): Rules, a solved example and controls.
- [Cat Sudoku tips](https://puzzdoku.com/cat-sudoku/tips/): Seven techniques: small regions, locked lines, touch eliminations, region groups.
- 50 numbered levels: https://puzzdoku.com/cat-sudoku/levels/1/ to https://puzzdoku.com/cat-sudoku/levels/50/ (each with board facts, the first three logical steps and a solution)

## Sudoku

- [Sudoku](https://puzzdoku.com/sudoku/): Unlimited 9×9 Sudoku in easy, medium, hard and expert, with notes and explained hints.
- [Daily Sudoku](https://puzzdoku.com/sudoku/daily/): One new Sudoku each day, easy Monday to expert Saturday.
- [Sudoku solver](https://puzzdoku.com/sudoku/solver/): Solve any Sudoku, check uniqueness, or reveal one explained step at a time.
- [How to play Sudoku](https://puzzdoku.com/sudoku/how-to-play/): Beginner rules, vocabulary and first techniques.
- [Sudoku tips](https://puzzdoku.com/sudoku/tips/): Scanning, singles, pointing pairs, naked pairs, X-Wing.

## Kakuro

- [Kakuro](https://puzzdoku.com/kakuro/): Cross-sum number puzzles with a combination helper.
- [Kakuro levels](https://puzzdoku.com/kakuro/levels/): 30 levels from 4×4 to 8×8.
- [How to play Kakuro](https://puzzdoku.com/kakuro/how-to-play/): Rules, reading clues and a worked example.
- [Kakuro tips](https://puzzdoku.com/kakuro/tips/): Unique combinations chart and solving techniques.
- 30 numbered levels: https://puzzdoku.com/kakuro/levels/1/ to https://puzzdoku.com/kakuro/levels/30/

## Site

- [Puzzdoku home](https://puzzdoku.com/): Today's Cat Sudoku plus links to every game.
- [Daily puzzles](https://puzzdoku.com/daily/): Today's daily Cat Sudoku and daily Sudoku in one place.
- [About Puzzdoku](https://puzzdoku.com/about/): How puzzles are generated, verified unique and rated.
- [All puzzles and guides](https://puzzdoku.com/sitemap/): A complete directory of games, levels, rules and solving guides.
- [Contact](https://puzzdoku.com/contact/): How to reach the Puzzdoku team.
- [Privacy policy](https://puzzdoku.com/privacy/): Progress stays in your browser; cookies and ads explained.
- [Terms of use](https://puzzdoku.com/terms/): Terms for using the site.

## Optional

- [Full rules and FAQs in plain text](https://puzzdoku.com/llms-full.txt)