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Sudoku Classic

November 19, 2025

More About Sudoku Classic

With Sudoku Classic now you have the famous logic puzzle always with you - for free and offline. Whether you’d like to relax or keep your mind active - pass your free time in a pleasant way. More than 60,000 Sudoku puzzles guarantee incredible gameplay. Six different levels of difficulty, additional helper functions, track your progress with statistics, celebrate your achievements and conquer the leaderboards. Playing Sudoku on the smartphone is as good as with a real pencil and paper.
Features:
• Free and fully usable offline
• More than 60,000 Sudoku puzzles
• 6 Sudoku difficulty levels: from BEGINNER to EVIL 17
• Solve puzzles automatically with auto-solver
• Notes as on paper
• Eraser for getting rid of all mistakes
• Undo option for reverting mistakes or accidentally moves
• Save and continue game whenever you want
• Achievements and leaderboards using Google Play Games
• Statistics to track your progress for each difficulty level: analyze your best times
• Night Mode theme
• Optimized for Smartphone and Tablet

Optional helper functions:
• Input buttons are highlighted if a number is used 9 times (or more) in the Sudoku puzzle
• Highlighting of row, column and box of the conflicted entered numbers
• Highlighting of all fields which have the same value as the currently selected input button
• Additional random hints per game
• Clear notes automatically after number input

Train your brain with Sudoku app anywhere, anytime!

Latest Version

Version
1.4.5
Update
November 19, 2025
Developer
Relity Games
Apps
Puzzle
Platforms
Android
Downloads
1,285,130
License
Free
Package Name
com.sbox.sudokuclassic
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User Reviews

NIKOLAS PALAPANIDIS

1 year ago

Smooth game rolling, various levels, clear interface. (I just don't know why it adds a 1:20 penalty time in each game). Update on review: A few hours after my review and my 'wondering' about extra final time, I got the (very reasonable) answer from the developer! Excellent !!! Thank you very much!

valerie estis

4 months ago

The game has a user friendly interface and ads appear after you have completed a game, so it doesn't interrupt play.

Jaddy Marie

2 years ago

Love the app. Great game. Honestly, the evil level is definitely not something to do right before bed. Only I do hate the ads! Just let me buy no ads! Please, I hate ads. I just want to opt to have no ads.

R Rogers

2 years ago

At the end of every game I don't care to be forced to view additional game offers the author wants to download. Otherwise I enjoy uninterrupted Sudoku play and can recommend it to serious players.

Johan Duparc

1 year ago

Nice app, but Fullscreen ads with sound ruins it. Very unpleasant when that wakes up your sleeping partner. The back button is disabled at that point which makes things even worse.... Removed a star : second time all my stats are lost :'( Edit : stats are randomly lost (setings are reset in the process) Edit: no I don't use a cleaner app

Zoltan B

2 years ago

Bugs: 1. No deactivation of number 9 when completed. 2. Already set settings disappear occasionaly. 3. It seems there are multiple results available in a single game (deadly pattern). Otherwise, I do like it when watching out for these mentioned.

michelle crum

2 years ago

The only thing I don't like is if you exit out of game or take a break, you can't go back and finish it. It'd be helpful to be able to change color pallet fir the numbers during note writing. Thanks

Scott Carlin

1 year ago

THE BEST! FREE & MINIMAL ADS!! This is a GREAT app. Excellent design, almost no ads. When the ads do show, they are super short. The settings are extensive and let the user tune the so to thier preferences. 100% recommended!

Missouri_Dave

3 years ago

Sometimes the game squares opens in a smaller window similar to 1 handed version of the phones regular screen. But it is not in that mode. The touch doesn't line up with the smaller version. I have to guess where to hit yes to exit. I doesn't do it all the time but when it does it will never open full screen again. I uninstall and reinstall until it does it again. It only started doing this 4 to 6 months ago. Samsung S20 Feb

Ally Cat

1 year ago

Best Sudoku game out there. I might be addicted. I have dreams about this game. The Evil 17 mode is the only game mode I play and it is burned into my brain. I have stayed up long nights because of this game, and missed sleep to get just one more game in. Ads are decently placed and not too intrusive. Best Sudoku game ever.

Joshua Ohl

1 year ago

Not too many ads, and you get what you expect. I already tested higher. It KEEPS asking me to rate again. About to uninstall. It keeps asking me to rate it even though I have already done so. If I could remove stars I would. The game is fine, but I'm tired of it burning be too review it. They're still asking for a rating. At least 200 times, even after I rated it before.

Mikoyan Gurevich

10 months ago

Very good. Interface feels awkward at the start but then I realized its befeits and I like it now. I wish when selecting a number it would highlight not only already set instances but also penciled instances of that number. Thanks!

mina

2 years ago

This is the best sudoku app in my opinion. Its interface is super easy to understand and navigate, the only ads are after completing a game and they show up like once every 10 games. You can customize the game layout too, add hints and helpers or you can just do it the primitive way, with no help. Either way, this is my current hyper-fixation since it doesnt drain battery and can be used if youre stranded in the desert with no service.

Skay

1 year ago

What a relief to find a simple version of Sudoku where the helper features can be disabled (like highlight selected number, highlight wrong inputs area, etc.). I want to use my brain to check my numbers instead of being assisted and this app makes that available as an option. The ads are very reasonable; they are either short or can be skipped after a short time. I find playing Sudoku on this app quiet and calming. Thanks for developing this classic version.

S K

1 year ago

Ok app. No worse than the other half dozen I've installed and removed recently. My 2 biggest issues which seem to be common with all Suduko apps are twofold, (1) being able to see the board without ANYTHING highlighted. I want to see the board without visual distractions and (2) this app specifically doesn't allow me to select a specific cell to work in. With other apps, I can press &hold a cell, and the corresponding row/column are highlighted. I can't seem to find an app with these features.

Kate Oszko

1 year ago

Love that you can switch between levels. Love that you can delete unfinished games. It is perfect for me as I'm new to sudoku (I've been living under a rock). It's a non-gamified, elegant app that does exactly what you want it to do. Even the ads aren't overly annoying, but they're annoying enough that I'll upgrade soon.

Alyce Warmington

2 years ago

I wanted an app to play Sudoku, and this definitely works! Haha. The ads aren't too bad and most of them skipable. However I don't understand the time penalties... what is the time I'm trying to beat??? They're really frustrating, I can't find anything on why they exist/ what times I should be striving for??? I solved a hard difficulty puzzle in 4 minutes and still got a penalty. Devs please end my suffering and tell me why I'm being penalised :(

Leon John Ozark

1 year ago

I've been playing for a long time and have been a fan of this version and don't want you to change it on me until I reach my goal of 2000 wins! I find the new version you keep trying to upgrade is graphically too busy and I don't need to have the extra help numbers posted. It takes away from the simplicity of the older version. Keep the numbers large and the grid blue this is just my opinion and I don't see a need to alter anything. I would like to see a list of record times for each puzzle .

Patricia Tyler

4 months ago

I previously had a sudoku app, which I really liked, but which now does not now work. This one is is good, except for the controls, which are not intuitive; its also very easy to input the wrong number. The degree of difficulty, is not accurate. I am not a good player, yet am on the Hard group, (level 4) which I consider to be intermediate, at best - many would rate them as easy (beginner or level2). Practically ad free, and only at the beginning, and you can turn off. I am enjoying using it.

M W

3 years ago

Great port of Sudoku! I am not being bombarded with ads or fake clicks which is an issue i found on other apps. I really enjoy the helper setting and other personalizations as I am a beginner at Sudoku and it's helping me learn much quicker. I'm grateful for the different level challenges too. I only wish there was a setting to turn off (or maybe make invisible) the timer, as I like to play casually not competitively. Though, maybe the setting is there and I've missed it.

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