Comparison

⋆Sudoku vs Challenge! Sudoku

Price, ratings, monetisation and update history for both games, side by side — with what reviewers say about each.

Head to head
About

⋆Sudoku

This app offers a classic Sudoku puzzle experience with a modern design and intuitive controls. It features five difficulty levels, a smart hint system that teaches logic, and daily challenges to keep your mind sharp. Track your progress and enjoy a customizable and relaxing gameplay.

Highlights
  • Smart hint system teaches logic
  • Five difficulty levels
  • Daily puzzle challenges
  • Customizable board and themes
  • Progress tracking and statistics
  • Auto-fill and auto-check options
Features
Read full description

Sudoku by Brainium has updated the classic Sudoku puzzle game you know and love, with a clean, modern design, calming backdrops, and intuitive controls. With endless number puzzles and five levels of difficulty, our Sudoku is perfect for players of all skill levels. Whether you’re in the mood for a quick game to help you relax, or an expert level logic challenge to train your brain, there’s a board for you. Brainium Sudoku also features the first and best smart hint system available. It goes beyond simply giving you the answers. Instead, it helps you learn and improve your skills by teaching you “why” the answer is what it is. With every puzzle, our “Hint” button provides the techniques you need to make progress even when it seems like your path is blocked. The instructions are easy to understand, unique for every puzzle, and presented with easy to follow, helpful animations and colorful visuals. This feature will improve your Sudoku skills whether you’re a first-time player or a seasoned expert. It’s the perfect companion for anyone looking to take their number game or logic puzzle skills to the next level. Enjoy a clear, easy to read, and customizable Sudoku board with visual guides that make reading the board and figuring out where to place your next numbers a breeze. Our input system is designed to make entering numbers and notes simple, and our user-friendly scoring system makes it easy to compete with yourself or friends. Starting and keeping a daily habit of mental exercise is easy by playing Sudoku’s Daily Puzzles, which are sure to keep your mind sharp and at ease. Track your progress with onboard statistics and unlock fun achievements along the way. Brainium’s Classic Sudoku Features: • The world’s most advanced Sudoku learning tool and hint system • Hints that teach you the logic behind the answer • Five perfectly balanced difficulty levels from beginner to expert • Daily Puzzle Challenges - complete them to earn points and gold checkmarks • Two beautiful grid styles • Nine relaxing backdrops • Light or dark grid fonts with adjustable size • Auto Light/Dark mode adjusts the theme based on your device settings • Unlimited collection of brain training logic puzzles • Game Statistics to track progress • Auto-Fill Notes option • Auto-Clear Notes option • Auto-Check Errors option • Number Painting option allows you to rapidly fill open squares with a selected number or note • Universal App looks great on iPhone and iPad • Global and friend leader boards • Portrait and landscape play options • Right or left-handed option in landscape • iPad keyboard compatible We hope Sudoku by Brainium brings you endless fun, relaxation, and a challenge for your mind. More Fun & Free Logic and Classic Card Games from Brainium: • Solitaire • Mahjong • Spider Solitaire • FreeCell • Pyramid • Blackjack Like us on Facebook http://www.facebook.com/BrainiumStudios Follow us on Twitter @BrainiumStudios Visit us on the web https://www.Brainium.com/

About

Challenge! Sudoku

Engage in classic Sudoku puzzles with a competitive edge. Challenge players globally and locally to achieve top rankings on leaderboards. Customize difficulty levels to suit your skill, from beginner to expert.

Highlights
  • Global ranking system
  • Compete with friends
  • Multiple difficulty levels
  • User-friendly interface
  • Record sharing
Features
Read full description

* Introduction Our Sudoku app offers a simple yet addictive classic puzzle. Compete with other users and aim for the top position on the Sudoku rankings. * Key Features Ranking System: Share Sudoku records with players worldwide and compete on the rankings. Various Difficulty Levels: Suitable for beginners to experts, with customizable difficulty settings. Compete with Friends: Share Sudoku records with friends and compete together. User-Friendly Interface: Enjoy playing Sudoku with an intuitive and easy-to-use interface. * How to Get Started Choose your preferred Sudoku difficulty. Solve Sudoku puzzles and achieve records. Compete with others to rank higher on the leaderboard! Use our Sudoku app to improve your skills and aspire to become the Sudoku champion of the world!

Screenshots

⋆Sudoku4 screens
Challenge! Sudoku4 screens

Verdict

The call

The clearest difference is review sentiment: Challenge! Sudoku at 100% against ⋆Sudoku's 64%. Challenge! Sudoku also leads on in-app purchases (none vs 1) and ads (none vs shown). ⋆Sudoku's advantage is ratings volume (161K vs 2). On price and device support there is nothing between them.

Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS

CostPrice · In-app purchases · Ads · Monetization

Both are free to download. ⋆Sudoku sells 1 one-off in-app purchase. Challenge! Sudoku asks for nothing beyond the download.

ReceptionRating · Positive reviews · Number of ratings

Challenge! Sudoku holds the better App Store score, 5.0 against 4.7. That said, the two scores are not equally well evidenced: ⋆Sudoku has 161K ratings behind it against 2, so its average is the more settled of the two. Written reviews point the same way: 64% of ⋆Sudoku's written reviews are positive against 100% of Challenge! Sudoku's.

UpkeepUpdate frequency

⋆Sudoku ships an update monthly, Challenge! Sudoku every 2 days. The most recent releases landed on October 24, 2026 and October 17, 2026 respectively.

Scorecard8 real differences · 2 level
⋆Sudoku versus Challenge! Sudoku: the parameters behind the verdict, then further details
Parameter⋆SudokuChallenge! Sudoku
PriceFreeFree
Rating4.7 (161K ratings)5.0 (2 ratings) — better
Positive reviews63.9% of reviews100.0% of reviews — better
Number of ratings161K — better2
Update frequencyMonthlyEvery 2 days — better
AdsYesNo — better
In-app purchasesYesNo — better
MonetizationFree with in-app purchasesFree — better
DevicesiPhone, iPad, iPod — betteriPhone, iPod
Requires iOS15.012.0 — better
Further details — not scored
Size316 MB58 MB
Age rating4+4+
DeveloperBrainium Studios LLCkyulabs

Customer experience

⋆Sudoku

All ratings161,022 ratings
Positive95.7%
Neutral2.8%
Negative1.5%
Written reviews1,467 reviews
Positive63.9%
Neutral7.7%
Negative28.4%

Challenge! Sudoku

All ratings2 ratings
Positive100.0%
Neutral0.0%
Negative0.0%
Written reviews2 reviews
Positive100.0%
Neutral0.0%
Negative0.0%

Bugs and requests

⋆Sudoku

Reported bugs

5 issues
  • Puzzle completion status not updating correctly
  • Floating number feature not working as expected
  • Scores not displaying properly on leaderboard
  • Game freezing or crashing on certain devices
  • Inability to play music in the background

Requested features

6 requests
  • Option to disable auto-check for errors
  • Ability to customize number colors and backgrounds
  • More granular difficulty settings between Hard and Expert
  • Ability to access past daily puzzles
  • Family sharing for ad-free version
Show 1 more
  • Clearer explanation of scoring system

Challenge! Sudoku

Not enough reviews yet to summarise bugs or requests.

In-app purchases

1 purchases

⋆Sudoku

One-time1
  • Remove Ads$11.99
None

Challenge! Sudoku

No in-app purchases

Questions

Is ⋆Sudoku free?
⋆Sudoku is free to download, with in-app purchases available.
Is Challenge! Sudoku free?
Challenge! Sudoku is free to download, with no in-app purchases.
Which has better reviews, ⋆Sudoku or Challenge! Sudoku?
Challenge! Sudoku is rated higher. ⋆Sudoku averages 4.7 out of 5 from 161K ratings, while Challenge! Sudoku averages 5.0 from 2 ratings.
Do ⋆Sudoku or Challenge! Sudoku have ads?
⋆Sudoku shows ads; Challenge! Sudoku does not.
Which is updated more often, ⋆Sudoku or Challenge! Sudoku?
⋆Sudoku ships an update monthly, and Challenge! Sudoku every 2 days. Most recently, ⋆Sudoku was updated on October 24, 2026 and Challenge! Sudoku on October 17, 2026.

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