# Killer Sudoku — Clean, simple, uncluttered > Killer Sudoku variant with sum cages, multiple sizes, and difficulty levels. (iPhone/iPad app by Ian Sutton.) - Source: https://appshunter.io/ios/app/killer-sudoku/id1514554345 (this page in markdown: same URL + `.md`) - Developer: [Ian Sutton](https://appshunter.io/developer/1514554344) - Category: Games, Puzzle - Price: Free with in-app purchases - Rating: 4.85/5 from 68 App Store ratings · 30 written reviews indexed - Age rating: 4+ - Requires: iOS 11.0 · 44 MB - Languages: English - Released: 2020-05-22 - Data updated: 2026-06-10 - Monetization: free with in-app purchases - User reviews in markdown: https://appshunter.io/ios/app/killer-sudoku/id1514554345/reviews.md ## What is Killer Sudoku? Just Killer Sudoku. Simple, clean, uncluttered. Killer Sudoku (aka Sumdoku / Mathdoku) is a Sudoku variant where cells are grouped into cages and the sums of the values in each cage are given. Once you know Killer, you will never go back to Classic again... The app includes lots of cute little 4x4 and 6x6 puzzles, perfect for beginners, with contextual hints to help you learn Killer techniques interactively. From there you graduate to 23 levels of chunky 8x8 and full-size 9x9 puzzles, guaranteed to stretch any brain. Are you one of the very few who can conquer 9x9 level 15??? The app has everything you could wish for: gazillions of puzzles at all sizes and levels, automatic notes, drag copy and repeat entries, sum calculator, cage summer, progress validator, and hints. ## Key features - Killer Sudoku variant - Puzzles of various sizes (4x4, 6x6, 8x8, 9x9) - Multiple difficulty levels - Contextual hints for learning techniques - Automatic notes - Drag copy and repeat entries - Sum calculator ## Pricing and in-app purchases Base price: Free. **One-time purchases** | Purchase | Price | Type | | --- | --- | --- | | Expert Pack | $1.99 | one-time | | Expert Pack 2 | $1.99 | one-time | | Advanced Pack | $1.99 | one-time | | Remove ads | $4.99 | one-time | | Intermediate Pack 4 | $1.99 | one-time | | Advanced Pack 2 | $1.99 | one-time | | Student Pack 4 | $1.99 | one-time | | Expert Pack 4 | $1.99 | one-time | | Expert Pack 6 | $1.99 | one-time | | Expert Pack 7 | $1.99 | one-time | | Expert Pack 8 | $1.99 | one-time | | Intermediate Pack 5 | $1.99 | one-time | | Intermediate Pack 8 | $1.99 | one-time | | Expert Pack 5 | $1.99 | one-time | | Advanced Pack 7 | $1.99 | one-time | | Advanced Pack 8 | $1.99 | one-time | | Zen Pack 2 | $2.99 | one-time | | Zen Pack 3 | $2.99 | one-time | | Zen Pack 1 | $2.99 | one-time | | Novice Pack | $1.99 | one-time | ## Recent user reviews (10 of 30) All indexed reviews: https://appshunter.io/ios/app/killer-sudoku/id1514554345/reviews.md ### 5/5 — Excellent, love it. *2024-12-06, version 3.1.1* This app works so well, really well thought out and no ads…well not yet anyway but i’m sure they will come. Most of these games have so many ads that it becomes impossible to play anymore. Personally i’d rather just pay a one off fee to keep it ad free, I understand it’s not a public service but I will certainly never pay monthly. Anyway congratulations to whoever designed this, it’s perfect. ### 3/5 — Great app - but *2024-03-26, version 3.1.1* Easy to use and great app, but some puzzles have more than one solution and some require guessing rather than deduction. Biggest problem is you soon run out of puzzles, even if you buy more, after two extra buys, no more are available, shame, have to know use alternative app. Later addition: he did make more available to purchase but these soon ran out, then found when trying to buy more that he was just reselling the same ones and charging for them, they wouldn’t even work because the app recognised you had already solved them! Had to get Apple to refund, shame really was a great app. ### 5/5 — Good! *2023-10-25* Fun game and love killer sudokus! ### 5/5 — Love it *2023-09-17* Like how it progresses from easy to difficult ### 5/5 — Amazing app *2023-08-19* You have everything you need and nothing you don’t. Really great to get off the social media for a while and zone out on a puzzle. Thanks for the awesome app :D **Developer response:** Lovely words jazzmartiiin. Happy solving! ### 5/5 — WAS my favorite game *2023-01-15* Loved the game! ⭐️⭐️⭐️⭐️⭐️But ever since my app auto updated on 1/12/23 there is a huge glitch. When I select a box to enter a number. The number is placed in a different box than the one selected. Fix immediately please. Otherwise I give it a -⭐️ **Developer response:** Hi Newbie, We have a few users reporting this and we hope that it is fixed in v3.0.4 which started rolling out a couple of days ago. What device are you using? Thanks (a) for calling out the problem and especially (b) for doing so nicely :) ### 5/5 — Fun *2023-01-02, version 2.2.1* Easy to use, intuitive, well designed. No crazy graphics or flashy gimmicks. ### 4/5 — Good but want to redo completed puzzles *2022-12-05, version 2.2.1* So much fun but I wish I could redo the puzzle I have already completed. It would be fun to try and beat my time on them. ### 5/5 — Gets harder with each level *2022-11-06, version 2.2.1* As a killer sudoku expert, I wasn’t sure when I started using this app as the first few puzzles were too easy. However, it gets harder with each level. There are four puzzles on each level and I’m up to level 5 and looking forward to continuing. Still easy at present but great for a 15-min coffee break. Would like to add that I like the grids. Some symmetry and no blocks with a single number (unlike some other less polished apps). ### 5/5 — The best *2022-09-15, version 2.2.1* This is the best Killer sudoku app I’ve come across. Nice simple interface (IMHO its better if you change the line colour to dark green in settings). The way it handles pencil marks is brilliant. Just enter more than one number in a cell and it takes them as pencil marks without any need to toggle a special key first. The program just knows. And if there are already pencil marks in the cell, a longer tap ensures you input that single number and overwrite whatever was there before. Also you can put numbers into more than one cell at a time. Just enter them in one cell and slide to copy to as many other cells as you want. What a time saver. It’s utterly no fuss. The easiest data entry ever. This is the app I’ve been looking for ever since I discovered how much more fun Killer is than ordinary sudoku. ## Frequently asked questions about Killer Sudoku ### What is Killer Sudoku? Killer Sudoku, also known as Sumdoku or Mathdoku, is a variant of Sudoku. In this game, cells are grouped into cages, and the sum of the numbers within each cage is provided. Players must deduce the numbers for each cell based on these sums and standard Sudoku rules. ### What are the key features of this app? The app offers a wide variety of Killer Sudoku puzzles in different sizes (4x4, 6x6, 8x8, 9x9) and difficulty levels. It includes interactive hints to help learn techniques, automatic notes, drag copy and repeat entries, a sum calculator, and a progress validator. ### Is this app free to play? The app is free to download and play, but it does offer in-app purchases and contains advertisements. These may enhance the user experience or provide additional content. ### What devices is this app compatible with? While specific operating system versions are not detailed, the app is designed for mobile devices. It is generally compatible with most modern smartphones and tablets running iOS or Android. ### Who would enjoy playing this app? This app is ideal for puzzle enthusiasts, particularly those who enjoy Sudoku and are seeking a more complex and mentally stimulating challenge. It's suitable for beginners learning Killer Sudoku techniques and experienced players looking to test their skills on difficult puzzles. ## Version history (last 5 releases) ### 3.1.1 — 2023-09-04 Minor updates ### 3.1.0 — 2023-08-07 Minor updates ### 3.0.6 — 2023-03-01 Minor updates incl. visual indicator on number button when entered ### 3.0.5 — 2023-02-06 Landscape mode ### 3.0.4 — 2023-01-15 Puzzle option to use system font ## Apps similar to Killer Sudoku | App | Rating | Price | Category | | --- | --- | --- | --- | | [Killer Sudoku by Logic Wiz](https://appshunter.io/ios/app/killer-sudoku-by-logic-wiz/id1641151077) | 4.9 (173) | Free | Games | | [Killer Sudoku - number game](https://appshunter.io/ios/app/killer-sudoku-number-game/id1576305047) | 4.7 (124) | Free | Games | | [All Sudoku - 5 kinds of sudoku](https://appshunter.io/ios/app/all-sudoku-5-kinds-of-sudoku/id1539312289) | 4.8 (24) | Free | Games | | [Killer Sudoku Master-SumSudoku](https://appshunter.io/ios/app/killer-sudoku-master-sumsudoku/id6464051208) | 4.5 (10) | Free | Games | | [Killer Sudoku Puzzle Games](https://appshunter.io/ios/app/killer-sudoku-puzzle-games/id1538715282) | 4.4 (8) | Free | Games | | [Kakuro Cross Sums Puzzles](https://appshunter.io/ios/app/kakuro-cross-sums-puzzles/id1542498165) | 2.3 (3) | Free | Games | ## More apps by Ian Sutton - [Jidoku](https://appshunter.io/ios/app/jidoku/id1633240985) All apps by Ian Sutton: https://appshunter.io/developer/1514554344 --- *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 2026-06-10.*