Mystery Sudoku

Solve Sudoku. Reveal a hidden photo. Every puzzle in Mystery Sudoku hides a picture underneath the grid — the more cells you solve correctly, the more of it you uncover, until the very last number clears the board and reveals the full image.

CLASSIC SUDOKU, NO GIMMICKS
Fill every row, column and 3x3 box with the numbers 1-9, no repeats. The same logic puzzle you already know, with a satisfying reason to finish just one more — perfect for anyone who loves number puzzles, logic games or relaxing brain training.

A NEW PICTURE EVERY GAME
Thousands of hidden images are waiting behind the grid — portraits, landscapes and more. You never know what you're solving for until the last digit falls into place.

DAILY PUZZLE & STREAKS
Come back every day for a fresh daily edition and build your solving streak.

BUILT FOR ACTUAL SOLVING
- Notes mode for pencil-marking candidates
- Undo and Erase when you change your mind
- Hint when you're stuck
- Mistake limit with mistake highlighting, so you know exactly where you slipped
- Difficulty levels that unlock as you play, from relaxed to expert

PLAY YOUR WAY
- Dark mode for late-night solving
- Sound on or off
- Clean, distraction-free board that scales to any screen

Whether you solve one puzzle on a coffee break or chase a daily streak for months, Mystery Sudoku turns every finished grid into a small reward. A free, easygoing puzzle game for sudoku fans and casual brain-game players alike.