Sudoku by Logify 4+

Write in the numbers‪!‬

Logify LLC

Designed for iPad

    • 4.7 • 1.3K Ratings
    • Free
    • Offers In-App Purchases



Play Classic Sudoku the most intuitive way: write in the numbers with your finger. Feels just like playing on paper, only better; number highlighting and other features will help you locate patterns without giving away the solution easily.

The game offers unlimited Sudokus in four difficulty levels from easy to expert. Each puzzle can be solved with logical reasoning; no guessing required. If you are new to Sudoku or want to try the next level up, use hints to learn new strategies. The advanced hint system will explain the logic behind each pattern and how to find it on your own. You will see that most of these strategies are not that difficult, even though it may be hard to find them on the board.

Summary of features:

• Number entry by drawing, no number pad
• Use your finger as eraser (left-right-left)
• Double tap to add/clear notes
• Number highlighting, including notes
• Completed numbers gray out (optional)
• Switch between levels anytime, last game saved for each level
• Unlimited puzzles, all solvable, no guessing required
• Advanced hint system designed to teach new strategies
• Auto notes (for hard and expert level)
• Auto complete button (optional)
• Daily Challenges
• Undo/Redo
• Statistics, top 10 times (tap on timer)
• Game Center leaderboard and achievements
• Font, board design, and backdrop options


What’s New

Version 1.42

Performance improvements, plus adjustments for iPhone 12 Pro Max.

Ratings and Reviews

4.7 out of 5
1.3K Ratings

1.3K Ratings

LisaSumthin ,

It Really Works

So far my favorite sudoko app, I love that I can write in the numbers, it’s refreshing from all the other apps where u have to select the box then select a number. Erasing is easy with a double circle. My only issue is the notes. You give us only the numbers that CAN be notes, which is a border line cheat. For notes ALL numbers should pop up and we choose the note. other than that great app. Please consider the note fix in your next upgrade.

Coming back for an update still my go to sudoku app, this app could be the number #1 app in the puzzle category but they don’t even care I believe. It’s absolutely fun being able to write the numbers.

Developer Response ,

Thank you for the great feedback! I'm glad you like the handwriting capability. For erasing, it's actually more reliable to swipe horizontally a few times, rather than double circle, which can sometimes be mistaken for a 6. As for the notes, I totally agree with you. Taking notes is really only meant to be used at Hard and Expert levels, where some of the advanced strategies involve eliminating notes. At lower levels, notes can make the solving too easy. There is a setting "Auto clear notes" (on by default), which automates the laborious task of manually clearing invalid notes after a number is entered. But when it is off, the initial notes that pop up should include all numbers as you suggested. We'll work on this next. Thank you again for the great insight!


JBoyd333 ,

Love it! Can you add coloring?

This is a really great app that lets you write the numbers instead of tapping or typing them, and the interface is slick. Since we can already write the numbers would it be possible to add coloring so that we can make our own notes in different colors for Medusa and other strategies? That would be awesome!

Developer Response ,

Thank you for the nice review! Coloring is on the list of features to be added. We would love to get your input on how you would like this to work, so please email us at

danwick ,

Allows errors

Great app, however it will allow errors even though it’s set to not allow. Somewhat confusing.

Developer Response ,

Thank you for the feedback! That settings is only for invalid entry, when it is conflicting with an existing number in the same row/column/block. If you make an error that doesn't match the solution but otherwise valid, the app will allow it, otherwise it would be too easy. That said, we will consider adding an "allow errors" option as well.

App Privacy

The developer, Logify LLC, has not provided details about its privacy practices and handling of data to Apple. For more information, see the developer’s privacy policy.

No Details Provided

The developer will be required to provide privacy details when they submit their next app update.


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