Cell by Cell Sudoku
Calm puzzles with step hints
Free · Designed for iPad. Not verified for macOS.
Hints that show where to look and why, not just the answer. 600 puzzles in four courses, a new puzzle every day, and optional rankings with family and friends. No ads.
A sudoku that never just hands you the answer. It helps you solve every puzzle yourself, one cell at a time.
No account and no ads. Plays offline.
STEP-BY-STEP HINTS WHEN YOU’RE STUCK
Choose where you want help (a cell, row, column or box) and the hint reveals one step at a time: where to look, why, then which digit. Nothing changes on the board until you tap Fill In, so you take only as much help as you want.
600 VERIFIED PUZZLES IN FOUR COURSES
Easy, Medium, Hard and Very Hard, 150 puzzles each. Every puzzle has exactly one solution and can be solved with single candidates and hidden singles; harder courses give fewer clues and fewer open moves at a time. Earn up to three stars a puzzle (finish it, no mistakes, no hints), collect stars and medals in each course, and unlock Hard and Very Hard as you go.
TODAY’S PUZZLE
A new puzzle every day. Keep your streak going and fill the monthly calendar for bronze, silver and gold trophies.
MY STATS
A skill rating with six ranks from Novice to Grandmaster, a skill profile, records for each course and 13 achievements to earn.
RANKINGS, IF YOU WANT THEM
Join to see your rank on Today’s Puzzle (your time plus 30 seconds per hint), add up points in the weekly league from Monday, or open a room with a six-character invite code to compete with family and friends (up to 12). You play under an anonymous nickname made from a word list, with no sign-in. Rankings stay off until you join, and turning them off deletes everything you sent.
YOUR OWN NOTES
Write candidates in fixed spots inside each cell. Entering a digit can clear that note from its row, column and box (you can turn this off), and one undo brings back the digit and the notes together.
MY PUZZLES: BRING YOUR OWN
Type in a sudoku from a newspaper or book, or paste it as 81 digits. The app checks that it has exactly one solution, then saves it so you can solve it here.
EASY ON THE EYES
Three painted backgrounds (Paper, Garden and Night), light and dark appearance, large text support, sound effects and adjustable haptics. Works on iPhone and iPad, in English, Japanese and Korean.
AUTOSAVE ON YOUR DEVICE
Digits, notes and undo history save automatically, so you can pick up where you left off. Games, records and settings stay on your device. Only when you join rankings are your anonymous nickname and results sent. No account, no ads, no analytics.
Hints use two techniques: single candidates and hidden singles. All 600 included puzzles can be solved with them. A puzzle you type in may need harder techniques; then some steps have no hint, and the app tells you so.
Ratings & Reviews
- This app hasn’t received enough ratings or reviews to display an overview.
More to play, more to chase.
• Four courses, Easy to Very Hard: 600 puzzles, up to three stars each, medals and courses to unlock.
• Today’s Puzzle: a new one every day, with streaks and monthly trophies.
• My Stats: skill rating, ranks and achievements.
• Rankings (optional): today’s rank, a weekly league and rooms for family and friends. Anonymous nickname, no sign-in.
• A ripple and stars when you finish, and sound effects you can turn off.
Games in progress and your own puzzles carry over.
The developer, PiFl Labs Co., Ltd., indicated that the app’s privacy practices may include handling of data as described below. For more information, see the developer’s privacy policy .
Data Linked to You
The following data may be collected and linked to your identity:
- User Content
- Identifiers
Accessibility
The developer has not yet indicated which accessibility features this app supports. Learn More
Information
- Seller
- PiFl Labs Co., Ltd.
- Size
- 25.8 MB
- Category
- Puzzle
- Compatibility
Requires iOS 17.0 or later.
- iPhone
Requires iOS 17.0 or later. - iPad
Requires iPadOS 17.0 or later. - Mac
Requires macOS 14.0 or later and a Mac with Apple M1 chip or later. - Apple Vision
Requires visionOS 1.0 or later.
- iPhone
- Languages
English and 2 more
- English, Japanese, Korean
- Age Rating
4+
- 4+
- Copyright
- © 2026 PiFl Labs Co., Ltd.