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.
Your daily puzzle break.
Free Cat Sudoku, Sudoku & Kakuro. A little focus, at your own pace.
Today's Cat Sudoku #1 November 5, 2026
Choose a level →A place for every cat.
Find them all, one square at a time.
Tap a square to place a cat. Choose Mark to cross out squares.
How to play & cat styles
- One cat in each row, column and color.
- Cats cannot touch, even diagonally.
- Use Mark to cross out squares; drag to mark several.
C places a cat · X marks · arrows move.
Rules: one cat in every row, column and colored region. Cats can't touch, not even diagonally. Full rules
Progress saved on this device. Take your time.
Puzzdoku is a free website for Sudoku-style logic puzzles: Cat Sudoku, classic Sudoku and Kakuro. Every puzzle has exactly one solution, runs in your browser and saves your progress automatically. New daily puzzles appear at midnight in your time zone.
Choose your puzzle
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.
Which puzzle should you play?
| Puzzle | You place | Main rule | Math? | Good for |
|---|---|---|---|---|
| Cat Sudoku | Cats | One per row, column and color; cats never touch | No | Short breaks and beginners |
| Sudoku | Digits 1–9 | Each digit once per row, column and 3×3 box | No | Classic daily habit, easy to expert |
| Kakuro | Digits 1–9 | Runs add up to their clue, no repeats | Addition | Number lovers who want a new twist |
Why play on Puzzdoku?
- One answer, no guessing. A solver verifies every board has a single solution before it's published.
- Hints that teach. Stuck? A hint explains the next logical step in plain words instead of just filling a cell.
- Daily habit, zero friction. A new Cat Sudoku and Sudoku each day, with streaks saved on your device. No account needed.
- Works everywhere. Phone, tablet or desktop, light or dark mode, mouse, touch or keyboard.
Frequently asked questions
What is Puzzdoku?
Puzzdoku is a free website of Sudoku-style logic puzzles: Cat Sudoku, classic 9×9 Sudoku and Kakuro. Every puzzle runs in your browser with no download, no account and no timer pressure.
Is Puzzdoku free?
Yes. All puzzles, daily challenges, hints and the Sudoku solver are free. Your progress is saved in your own browser, so you don't need to sign up.
Does every puzzle have exactly one solution?
Yes. Every Cat Sudoku, Sudoku and Kakuro puzzle on Puzzdoku is checked by a computer solver to have a single unique solution, and Cat Sudoku boards are also checked to be solvable by logic alone, without guessing.
When does the daily puzzle change?
The daily Cat Sudoku and daily Sudoku change at midnight in your local time zone. Everyone gets the same puzzle on the same date, so you can compare times with friends.
Which puzzle should I start with?
Start with Cat Sudoku level 1 if you're new to logic puzzles: it's a small 5×5 board you can finish in a minute or two. If you already know Sudoku, try today's daily Sudoku. Kakuro is best once you enjoy arithmetic.