Puzzle Game
Muzukashii: Focused Sudoku
A calm Sudoku with one twist: only the 3×3 box you're working on is visible. The rest of the board you keep in your head. Swipe between boxes, follow the red arrows when a digit clashes with one you can't see, or switch to Classic mode and play with the full board. No ads.
- No ads
- Daily Sudoku
- Classic mode
- Logic-graded puzzles
- Android soon
See less. Think more. Sudoku, one box at a time.
A look inside
Coming soon to Android
Muzukashii for Android is almost here.
The same one-box Sudoku, Classic mode, Daily Challenge and graded puzzles, with the same autumn-leaf look and quiet music, built for Android phones and tablets. Still no ads.
- Phones and tablets
- The same puzzles and Daily Challenge
- One-box and Classic mode
- No ads
What's inside
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One box at a time
Only one 3×3 box of the nine-by-nine board is on screen. Swipe or tap the mini-map to move, and keep the rest in your head. It's Sudoku that trains memory and focus as well as logic.
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Classic mode
When you'd rather see everything, switch to Classic mode and play a regular Sudoku with the full board, using the same puzzles and the same calm style.
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Puzzles graded like a person solves them
Every puzzle is solved step by step with human techniques, and the hardest one it needs sets the level: singles for Ichi, pairs and box-line reduction for Ni, X-Wing, Swordfish and XY-Wing for San. Clue count doesn't decide it.
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One solution, no guessing
Every puzzle has exactly one solution and can be finished by logic alone. Clues sit in a balanced, symmetric pattern, and each puzzle is also scored on how hard it is when you can only see one box.
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A daily Sudoku
One new puzzle every day, the same for every player. A calendar keeps your streak, lets you catch up on missed days, and gives a gold star for solving on the day.
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Calm by design
No ads and no popups. Koyo autumn colours: maple red, ginkgo gold, washi-paper cream. Soft bamboo-flute music, a pencil scribble for each digit and a page turn when you change boxes.
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Conflict arrows
The board you can't see still talks back. When a digit clashes with one in another box, small red arrows point the way.
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Notes, undo and autosave
Pencil notes clear themselves when you place a digit, undo goes all the way back, finished digits fade on the keypad, and every game saves so you can pick it up any time.
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Leaderboards and achievements
Points for every solve, best times per level, a daily leaderboard and achievements like Flawless and By Memory Alone through Game Center.
About Muzukashii
Muzukashii (Japanese for “difficult”) is a calm, minimalist Sudoku that hides most of the board. You see only the three-by-three box you’re working on; the rest of the nine-by-nine lives in your head. Swipe between boxes or tap the mini-map to move around, and let the board you can’t see talk back through small red arrows when a digit clashes with one hidden elsewhere. When you want the traditional game, Classic mode shows the whole board.
The puzzles are made with care. Each one has exactly one solution, can be solved by logic alone, and is graded by the techniques a person needs to solve it, from simple singles on Ichi to X-Wing, Swordfish and XY-Wing on San. Each is also scored on how hard it becomes when you can only see one box at a time.
It’s wrapped in a Koyo (autumn-leaf) atmosphere: washi paper, Sumi ink, soft bamboo-flute music, and a page turn on every box change. Play three difficulties, keep a streak with the daily Sudoku, climb Game Center leaderboards and collect achievements. An Android version is coming soon.
A single, optional Supporter Edition tip unlocks a few cosmetic extras, but the whole game, including every puzzle, the Daily Challenge, Game Center and iCloud sync, is free to play with no ads.
Questions
How is Muzukashii different from normal Sudoku?
It is a full nine-by-nine Sudoku, but you only see the three-by-three box you're working on. The rest of the board lives in your memory. Swipe between boxes, and red arrows point to a clashing digit hidden in another box.
Can I play classic Sudoku with the whole board?
Yes. Classic mode shows the full nine-by-nine board, like a regular Sudoku. You can switch to it during any casual puzzle. Classic rounds are untimed and don't count toward leaderboards, and the Daily Challenge is always played one box at a time.
How are the puzzles made and graded?
Each puzzle is generated with exactly one solution and solved step by step using human techniques, without guessing. The hardest technique needed sets the level: Ichi needs only singles, Ni needs pairs and box-line reduction, and San needs X-Wing, Swordfish or XY-Wing. Clue count alone never decides the difficulty.
Is there a daily Sudoku puzzle?
Yes. The Daily Challenge is one new puzzle a day, the same for everyone, with a calendar that tracks your streak and lets you catch up on recent days you missed.
Does Muzukashii have ads?
No. There are no ads and no advertising or tracking SDKs. Every puzzle, the Daily Challenge, Game Center and iCloud sync are free to play. An optional one-time Supporter Edition adds cosmetic extras like dark mode and an alternate app icon.
What does Muzukashii mean?
Muzukashii (難しい) is Japanese for difficult. The three difficulty levels are named Ichi, Ni and San, Japanese for one, two and three.
Which devices can I play on?
iPhone, iPad, Mac and Apple Vision Pro, with Daily Challenge progress and settings synced through iCloud.
Is Muzukashii available on Android?
Not yet, but soon. Muzukashii for Android is coming to Google Play with the same one-box Sudoku, Classic mode, Daily Challenge and graded puzzles, and still no ads.
A single one-time tip.
The app stays fully playable without it. Nothing behind the gate is required to solve a puzzle. Adds dark mode, an alternate app icon, a custom splash and a supporter badge, with more to come at no extra cost.
