# Sudoku & Killer: SudoKoi — No Ads. Logic Puzzles. Minimal > Ad-free Sudoku and Killer Sudoku puzzles with offline play and progress tracking. (iPhone/iPad app by Fabian Zwick.) - Source: https://appshunter.io/ios/app/sudoku-and-killer-sudokoi/id1521868089 (this page in markdown: same URL + `.md`) - Developer: [Fabian Zwick](https://appshunter.io/developer/1521868091) - Category: Games, Board, Puzzle - Price: Free with in-app purchases - Rating: 4.80/5 from 61 App Store ratings · 19 written reviews indexed - Age rating: 4+ - Requires: iOS 14.0 · 35 MB - Languages: German (Germany), European Spanish, American English, Japanese, French (France) - Released: 2020-10-21 - Data updated: 2026-08-29 - Monetization: freemium - User reviews in markdown: https://appshunter.io/ios/app/sudoku-and-killer-sudokoi/id1521868089/reviews.md ## What is Sudoku & Killer? 〉No ads. No paywalls. Just great puzzles. SudoKoi is the Sudoku app that gets out of your way. Open it, pick a puzzle, and play. No account. No loading screens. No interruptions — ever. Most puzzle apps are built around ads and dark patterns. SudoKoi is built around the puzzle. 〉Everything You Need. Nothing You Don't. • Classic Sudoku + Killer Sudoku in one app • 5 difficulty levels — Easy to Expert • Smart notes and candidate tracking • Helpful highlights and error detection • Fast, intuitive number input • Play up to 9 games at once • Scan printed Sudoku puzzles from paper • Track your stats and watch yourself improve • Share puzzles with friends 〉Fits Into Your Day Whether you have 2 minutes or 20, SudoKoi is there. Fully offline. No login. No loading screens eating your time. Optimized beautifully for iPhone, iPad, and Mac. 〉Start Free. Upgrade Only If You Want To. A handpicked selection of Classic and Killer puzzles is always free — no timer, no artificial limit. SudoKoi+ unlocks everything: • Thousands of handcrafted puzzles • Unlimited play across all packs • Monthly, yearly, or one-time lifetime options Privacy Policy: https://sudoku.efabian.me/privacy/ Terms of Service: https://sudoku.efabian.me/terms/ ## Key features - Classic and Killer Sudoku - 5 difficulty levels - Smart notes and candidate tracking - Scan printed puzzles - Offline play - Progress tracking - Play up to 9 games at once ## Pricing and in-app purchases Base price: Free. **Subscriptions** | Subscription | Price | Period | | --- | --- | --- | | SudoKoi+ | $0.99 | per month | | SudoKoi+ | $7.99 | per year | **One-time purchases** | Purchase | Price | Type | | --- | --- | --- | | SudoKoi++ | $24.99 | one-time | ## Recent user reviews (10 of 19) All indexed reviews: https://appshunter.io/ios/app/sudoku-and-killer-sudokoi/id1521868089/reviews.md ### 3/5 — Sudoko *2026-07-19* Es fehlen Vorschläge und Löschen alles nach dem ersten Fehler! ### 5/5 — Fantastic *2026-03-05, version 1.4.1* I have been using this app for quite a while now. It’s never caused me a problem, It works and does what it should. I even add newspaper SudoKoi to the app, works every time. If you love doing SudoKoi puzzles you’ll love this app. ### 5/5 — My favorite sudoku app *2025-09-28* Clean, good extreme puzzles, and killer mode. The automated deletion of notes is too helpful in normal sudoku, but I like it for killer sudoku. Snyder notations are a nice touch. **Developer response:** Thanks for the kind words. The automated deletion of notes can be turned off in the settings. On the main menu tap on the info button in the lower left corner. Kind regards ### 5/5 — Für Sudoku Liebhaber *2025-08-09* Das ist wirklich dir beste App für Sudoku-Liebhaber. Simpel aufgebaut und per Stifteingabe spielbar. Absolut das was ich gesucht habe. Man kann auch Fotos von einem Rätsel machen und es dann in der App lösen. Dafür habe ich mir auch sofort die Plus Variante gekauft. Hatte zwar ein Problem, aber der Support hat direkt weitergeholfen. Perfekt!! ❤️🤩 ### 3/5 — really good potential *2025-04-16, version 1.3.2* this app is designed really well, just missing settings that other apps have, such as "disable highlighting rows/columns/boxes" or "show errors" which i prefer to play on. i'll probably stick with another app unless this one adds settings so you can pick your preferences ### 5/5 — For every level *2024-04-18, version 1.3.2* Takes a few games to adjust, with time you get used to the small screen and the prompts. ### 5/5 — Best Sudoku app for iPad *2023-10-10, version 1.3.1* This is by far the best app I’ve tried. It supports Split View which was how i originally found it. Not to mention there are no ads and it merges sudoku and killer sudoku into one app. ### 4/5 — Would be five stars without other sudoku format *2023-07-27, version 1.3.1* Title ### 5/5 — Great Sudoku app *2023-01-11* Not much else to be said, I use this on the Mac and it works great. Very responsive developer. **Developer response:** Thanks for the kind feedback! Keyboard shortcuts will be fixed in the next update coming shortly. And there will also be an option to show all mistakes immediately. Glad to hear you enjoy the app. Kind regards ### 5/5 — Excellent version of Sudoku *2023-01-11, version 1.3.1* Really like the design of this, be great to have an iPhone version for when I am travelling, and also a pause button, since there are times when I shut my macbook lid, but the timer keeps running and therefore can distort the average times. But other than that a flawless design and well implemented version ## Frequently asked questions about Sudoku & Killer ### Does SudoKoi have ads? No, SudoKoi is designed to be completely ad-free. The developers emphasize a puzzle-focused experience without interruptions, and the app has a 'hasAds' value of false. ### What is the price of SudoKoi? SudoKoi is free to download and play with a selection of puzzles. An optional subscription, SudoKoi+, is available for $0.99/month or $7.99/year, unlocking thousands of additional puzzles. ### Can I play SudoKoi offline? Yes, SudoKoi is fully offline. You do not need an internet connection to play any of the puzzles, making it convenient for on-the-go gaming. ### What devices does SudoKoi support? SudoKoi is optimized for Apple devices, including iPhone, iPad, and Mac. It also supports iPod. ### How often is SudoKoi updated? The app was last updated on March 7, 2026, indicating recent development. The latest version is 1.4.2. ### What age rating does SudoKoi have? SudoKoi has an age rating of 4+, making it suitable for a wide range of players. ### What makes SudoKoi different from other Sudoku apps? SudoKoi focuses on a minimalist, ad-free experience with no paywalls or dark patterns. It offers both Classic and Killer Sudoku, smart features, and the unique ability to scan printed puzzles. ### What are the SudoKoi+ subscription options? SudoKoi+ offers unlimited access to thousands of handcrafted puzzles. You can choose between monthly ($0.99/P1M), yearly ($7.99/P1Y), or a one-time lifetime purchase option. ## Version history (last 5 releases) ### 1.4.2 — 2026-03-07 This update fixes an issue with the timer. If SudoKoi has become part of your daily routine, a quick review helps more players find us — and means a lot to a small indie team. Thank you. ### 1.4.1 — 2025-09-29 Make SudoKoi your own with more options, smoother gameplay, and new widgets! ### 1.4 — 2025-07-25 New Coloring Feature! Bring your Sudoku puzzles to life by highlighting candidates with colors. Make it easier to track patterns, spot opportunities, and solve faster — all while enjoying SudoKoi’s clean and distraction-free design. Happy puzzling! ### 1.3.2 — 2024-03-28 If you’re reading this, SudoKoi just got a little bit better. Enjoying the app? Consider taking a moment to write a review! ### 1.3.1 — 2022-10-16 If you’re reading this, SudoKoi just got a little bit better. Enjoying the app? Consider taking a moment to write a review! ## Apps similar to Sudoku & Killer | App | Rating | Price | Category | | --- | --- | --- | --- | | [Killer Sudoku Puzzle Games](https://appshunter.io/ios/app/killer-sudoku-puzzle-games/id1538715282) | 4.4 (8) | Free | Games | | [Crane Sudoku - Puzzle game](https://appshunter.io/ios/app/crane-sudoku-puzzle-game/id1563765031) | 4.6 (104) | Free | Games | | [∞ Sudoku](https://appshunter.io/ios/app/sudoku/id6473160292) | 5.0 (3) | Free | Games | | [Killer Sudoku by Logic Wiz](https://appshunter.io/ios/app/killer-sudoku-by-logic-wiz/id1641151077) | 4.9 (188) | Free | Games | | [Sudoku - No Adverts, Ad Free!](https://appshunter.io/ios/app/sudoku-no-adverts-ad-free/id521559009) | 4.6 (604) | Free | Games | | [Killer Sudoku - number game](https://appshunter.io/ios/app/killer-sudoku-number-game/id1576305047) | 4.8 (182) | Free | Games | --- *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 2026-08-29.*