# Sudoku - No Adverts, Ad Free! — Number Puzzles, Hints & Solver > Classic 9x9 number puzzle game with adjustable difficulty and advanced tools. (iPhone/iPad app by The Chess Solitaire Sudoku Factory Ltd.) - Source: https://appshunter.io/ios/app/sudoku-no-adverts-ad-free/id521559009 (this page in markdown: same URL + `.md`) - Developer: [The Chess Solitaire Sudoku Factory Ltd](https://appshunter.io/developer/994180799) - Category: Games, Education, Board, Puzzle - Price: Free with in-app purchases - Rating: 4.60/5 from 604 App Store ratings · 353 written reviews indexed - Age rating: 4+ - Requires: iOS 15.1 · 56 MB - Languages: Greek, Dutch, German (Germany), Russian, Malay, Norwegian Bokmål, Swedish, European Spanish, American English, Italian and 4 more - Released: 2012-05-18 - Data updated: 2026-08-27 - Monetization: free with in-app purchases - User reviews in markdown: https://appshunter.io/ios/app/sudoku-no-adverts-ad-free/id521559009/reviews.md ## What is Sudoku? Enjoy classic Sudoku without adverts, from relaxing beginner puzzles to exceptionally difficult challenges created for experienced players. Choose a quick, simple game or put your logic skills to the ultimate test. With six difficulty levels, powerful solving tools and virtually unlimited puzzles, there is always a new Sudoku waiting for you. Play one of the built-in puzzles or enter any 9x9 Sudoku from a newspaper, magazine or elsewhere. Solve it yourself with pencil-style notes, ask for a helpful hint, or use the Sudoku solver and analysis tools to identify mistakes and discover your next move. PERFECT FOR EVERY PLAYER • Six difficulty levels: Simple, Easy, Medium, Hard, Very Hard and handcrafted Sudoku Master • Easy Sudoku puzzles for beginners learning the rules • Challenging logic puzzles for advanced and expert players • Virtually unlimited, uniquely generated Sudoku puzzles • Every built-in puzzle has exactly one valid solution • Complete a Sudoku every day and watch your solving improve • Play at your own pace, anytime and anywhere POWERFUL SUDOKU TOOLS • Create, solve and analyse Sudoku puzzles • Enter and play puzzles from newspapers or magazines • Add pencil-style notes for possible numbers • Use the Ball of String tool to track complex solving paths • Highlight mistakes and conflicting numbers • Automatically fill possible candidates • Colour-code cells and notes using a full palette • Choose from several types of helpful hints • Use Suggest a Technique to find your next logical move • Get help with advanced strategies including Triplets, Quads, X-Wings, Swordfish and Jellyfish MORE WAYS TO PLAY • Picture Sudoku • Grid Transform • A rewarding scoring system with the ultimate goal of becoming a Sudoku Master • Game Center achievements and leaderboards • Designed and refined with feedback from more than 200 Sudoku players Sudoku is an ideal daily brain exercise: relaxing when you want to unwind, yet demanding enough to give your logic, concentration and problem-solving skills a serious workout. Enjoy the familiar feel of pencil-and-paper Sudoku combined with the convenience and advanced tools of your device. Can you progress from your first Easy puzzle to the handcrafted Sudoku Master levels? PROFESSIONAL REVIEWS “Mastersoft Sudoku comes with an exceptional range of functions to help you play.” — Gadgetorama “Quite frankly, the best version of this game I have seen.” — PDA247 “Its intuitive interface, extensive options and picture-style puzzles make it one of the best Sudoku games available.” — PPCLife AWARDS • Winner — Handster Best Software Awards, 2008 • Winner — Smartphone Magazine Awards, 2008 • Winner — Smartphone Magazine Awards, 2007 • Winner — HP Choice Awards, 2005 • Number one in the HP chart for more than a year End User Licence Agreement: [http://www.TheChessSolitaireSudokuFactory.com/eula.htm](http://www.TheChessSolitaireSudokuFactory.com/eula.htm) Privacy Policy: [http://www.TheChessSolitaireSudokuFactory.com/privacy.htm](http://www.TheChessSolitaireSudokuFactory.com/privacy.htm) ## Key features - Six difficulty levels - Input puzzles from newspapers - Advanced solving hints - Note-taking tools - Mistake highlighting - Auto-fill options - Color-coding entries ## Pricing and in-app purchases Base price: Free. **Subscriptions** | Subscription | Price | Period | | --- | --- | --- | | Sudoku Pro Annual Subscription | $1.99 | per year | | Monthly subscription to Pro. | $0.99 | per month | **One-time purchases** | Purchase | Price | Type | | --- | --- | --- | | Purchase Pro Outright | $1.99 | one-time | | Purchase Outright | $2.99 | one-time | ## What do users think of Sudoku? Overall sentiment: positive **Pros** - 👍 Easy to use - 🧠 Challenging puzzles - 💡 Ability to enter own puzzles - 🎨 Color-coded numbers - 🔄 Undo/rewind feature - 🤖 Automatic solving of entered puzzles **Cons** - 🐛 Bugs in 'Hard' level puzzles - 🔒 Pro features locked behind paywall - 🤯 Difficulty levels not clearly differentiated - 🤔 Unclear scoring/rating system - 💸 Intrusive ads **Commonly reported bugs** - Puzzle grid freezing - Incorrect number removal - Pro features not working as expected - Sudden removal of 'Very Hard' difficulty level **Most requested features** - Ability to mark possible entries in a cell - More granular difficulty levels - Detailed instructions/explanations for features - Statistics tracking across all difficulty levels ## Recent user reviews (10 of 353) All indexed reviews: https://appshunter.io/ios/app/sudoku-no-adverts-ad-free/id521559009/reviews.md ### 1/5 — Toolbar is non-responsive *2026-07-23, version 4.67* v4.69 (33) installed on MacOS Ventura yields no response from icons within toolbar below the sudoku puzzle matrix. In game Help and Menu are therefore not accessible. One puzzle can be solve but no further progress is possible after that. ### 5/5 — schöner Sudoku löse *2026-07-21* Es gibt, es gibt verschiedenste Vorschläge für Lösungsmöglichkeiten, die man ausprobieren kann. ### 5/5 — Unterhaltsam *2026-07-12* Weiter so ### 1/5 — Sudoku *2026-07-10* I’m mad! I bought the full version years ago and then it was changed and I could no longer do the master level puzzles, now you’ve changed it again and not only can I not do the master level puzzles, but I can’t even do the very hard level puzzles either. Why did I buy it in the first place, and why would I purchase it again if you’re just going to change it again and make me buy it again. It’s criminal! This will be the third time I’ve bought this game! CRIMINAL **Developer response:** Please contact support so that we can get you a full version. ### 5/5 — Five Stars!!!!!! *2026-07-08, version 4.59.01* Excellent!!!!! ### 5/5 — Best Ever *2026-01-22, version 4.57.01* Since iPaq time. Can have a small visual work over. Fine in every aspect ### 5/5 — 👍👍 2 THUMBS UP!!! *2026-01-10, version 4.57.01* LOVE THE MANY OPTIONS!!! 💖💖 ### 5/5 — Farshid *2025-12-19, version 4.57.01* Zee ### 5/5 — Sodoku *2025-12-07, version 4.57.01* Love it! ### 5/5 — Sudoku for Life *2025-10-14* excelente exercício mental ## Frequently asked questions about Sudoku ### What is this app? This app provides a classic 9x9 number puzzle experience, commonly known as Sudoku. It offers a wide range of difficulty levels, from simple for beginners to very hard for advanced players. You can play unlimited puzzles generated by the app or even input puzzles from newspapers. ### What are the key features of this Sudoku app? Key features include six distinct difficulty levels, the ability to input and solve puzzles from external sources like newspapers, advanced hints and solving techniques (e.g., Swordfish, X-Wings), note-taking tools like a 'ball of string', mistake highlighting, and auto-fill options. It also includes color-coding for entries and a scoring system. ### Is this app free to download and play? The app is free to download and offers a free experience. However, it does include in-app purchases, which may unlock additional features or content. ### What are the benefits of playing Sudoku with this app? Playing Sudoku with this app can help exercise your brain, improve logical thinking, and enhance concentration. It's a great way to relax your mind while keeping it active. The app also helps you track your improvement over time with daily challenges. ### Can I use this app to solve Sudoku puzzles from my newspaper? Yes, absolutely. A significant feature of this app is the ability to transfer Sudoku puzzles directly from your favorite newspaper or any other source. You can then solve them within the app, using its tools and hints if needed. ## Version history (last 5 releases) ### 4.62 — 2026-08-11 We have removed all advertising. ### 4.60 — 2026-08-11 We have removed all advertising. ### 4.59.01 — 2026-07-04 The most complete implementation of Sudoku available on any format! Everything from "Suggest a Technique" to "Enter your own Sudoku". Winner of several awards! ### 4.58.01 — 2026-03-15 The most complete implementation of Sudoku available on any format! Everything from "Suggest a Technique" to "Enter your own Sudoku". Winner of several awards! ### 4.57.01 — 2025-07-24 Another fab update to our vintage Sudoku game. Did you know this app is 20 years old this year! Some minor tweaks and fixes. ## Apps similar to Sudoku | App | Rating | Price | Category | | --- | --- | --- | --- | | [Sudoku - Brain Puzzle Games](https://appshunter.io/ios/app/sudoku-brain-puzzle-games/id1442749804) | 4.8 (305,807) | Free | Games | | [Sudoku.com - Number Games](https://appshunter.io/ios/app/sudokucom-number-games/id1193508329) | 4.8 (1,847,599) | Free | Games | | [Sudoku· Classic Puzzle Games](https://appshunter.io/ios/app/sudoku-classic-puzzle-games/id1409781798) | 4.7 (63,544) | Free | Games | | [Vita Sudoku for Seniors](https://appshunter.io/ios/app/vita-sudoku-for-seniors/id6474989365) | 4.7 (9,401) | Free | Games | | [Sudoku : Daily Fun Puzzle Game](https://appshunter.io/ios/app/sudoku-daily-fun-puzzle-game/id6450412432) | 4.9 (2,336) | Free | Games | | [Chess - Learn, Play & Trainer](https://appshunter.io/ios/app/chess-learn-play-and-trainer/id378161776) | 4.6 (1,523) | Free | Games | ## More apps by The Chess Solitaire Sudoku Factory Ltd - [Kakuro u](https://appshunter.io/ios/app/kakuro-u/id306200861) - [Chess - Learn, Play & Trainer](https://appshunter.io/ios/app/chess-learn-play-and-trainer/id378161776) - [Solitaire Favorites](https://appshunter.io/ios/app/solitaire-favorites/id388837069) - [Fruit Salad Match 3 Slots](https://appshunter.io/ios/app/fruit-salad-match-3-slots/id435312037) - [Brain School 28 Training Games](https://appshunter.io/ios/app/brain-school-28-training-games/id525176256) All apps by The Chess Solitaire Sudoku Factory Ltd: https://appshunter.io/developer/994180799 ## Related topics [duodoku](https://appshunter.io/ios/topics/duodoku) --- *Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-08-27.*