# Killer Sudoku + — user reviews > 63 indexed App Store user reviews of Killer Sudoku + by James Gibbs, rated 4.76/5 from 299 ratings. - Source: https://appshunter.io/ios/app/killer-sudoku-plus/id866856408/reviews - App overview in markdown: https://appshunter.io/ios/app/killer-sudoku-plus/id866856408.md - Rating breakdown: 5★ 242 · 4★ 39 · 3★ 6 · 2★ 0 · 1★ 5 ## What do users think of Killer Sudoku +? Overall sentiment: positive **Pros** - 👍 Great game/app - 🧠 Challenging puzzles - 💡 User-friendly interface (once used to) - 💰 Good value for money/affordable - 🚫 No ads - ✅ Well-designed - 🔒 No tracking/privacy respected - 💯 High quality puzzles - offline Playable offline - 💪 Improves math skills - 🧩 Variety of puzzle packs - ✨ Many useful tools/features **Cons** - 🤔 Puzzles can vary in difficulty - 💰 Limited free puzzles - 🐛 Some puzzles have multiple solutions - 📱 Purchase restoration issues - 🖱️ Uncomfortable/confusing controls - 🔄 Undo functionality issues - 🛒 Download issues for extra puzzles **Commonly reported bugs** - Purchased packs disappear after factory reset/device change - Cannot download extra games, error message - Puzzles with multiple solutions - App jams after purchasing puzzles - App frozen/won't open - Pencil marks not working correctly - First screen is payment portal - App requires constant scrolling due to hidden menu **Most requested features** - Colorize squares individually - Left-handed option - Highlight all cells with a particular number - Highlight undone actions - Ability to undo undone actions - Game statistics (completion times, hints, errors) - Sort games by completion time - Remember timer setting between games - Turn off Undo including cage combinations - Hardware keyboard entry option for external keyboards - Android version - Doodle option for workings/sums - Pause button - Highlight duplicate numbers - Remove number from notes of influenced cells automatically - Clear button to remove all pencil marks - Calculator for sums - Add numbers into multiple squares at once - Hint feature that points to solvable square instead of solving - Rainbow coloring for cages - Tutorials/tips (e.g., 45 rule) ## Newest reviews (19 of 63) ### 4/5 — Pretty great, needs one more feature *2026-01-01, version 1.5.3* Love this game and the user interface is very fast and intuitive once you get used to it. It would have been 5 stars+ if it had the ability to colorize squares individually ### 4/5 — Suggestion *2023-07-28, version 1.5.3* When you undo something or many things it is hard to find what was undone - I would like to see highlighting added to what was undone or even just allow to undo the undone. It would be nice to highlight different colors (9 colors) however the players wanted to use highlights ### 4/5 — my favorite killer sudoku but would like some features *2021-12-28, version 1.5.3* I have tried several killer sudoku app and like this one the best generally. But I wish it would have some features such as game statistics (average completion times, number of hints used, number of error checks, etc). I’d also like to be able to sort games by completion time so that I could try to beat my old times on harder games. ### 5/5 — Simple, but perfect *2021-10-20, version 1.5.3* It’s everything I could ask for to play Sudoku. No ads, nothing done in the background so you can play offline, and a huge variety of games for just a couple bucks. Absolutely love it. ### 4/5 — Love This Game *2021-09-28, version 1.5.3* Developers - can you update the app so lefties can chose to have the grid on the right and number pad on the left. It’s my only quibble and my reason for 4 instead of 5 stars. ### 5/5 — Love it! *2021-02-18, version 1.5.3* Great game! ### 3/5 — Colin Pugh *2021-01-25, version 1.5.3* Fantastic app spoiled by no facility to transfer completed puzzles during the process of restoring purchases when changing to a new device. So I had completed around half if the extreme pack 1 of puzzles which all disappeared when I installed the app on my new iPhone and restored purchases. ### 5/5 — Best Killer Sudoku App on the iPad *2020-12-14* This is actually an app version of my favorite Killer Sudoku website. Most of the same features that make that the greatest website are present here, too, including: 1. Unique solutions every time! 2. Puzzle packs available for purchase at every level, including my level, the highest one, Extreme. 3. Most puzzles I've purchased are symmetrical, which is my preference. An exception is 100 Extreme Killer Sudokus #2. 4. The timer can be turned off. I never want my Killer Sudokus timed! 5. Pencil marks available, using the same keyboard. 6. An ability to check what's been entered, looking at the whole board. Unlike some other Killer Sudoku apps, it does not show in red a number that can't be correct based on what has already been entered, which I consider to be very distracting, even though some may consider it helpful. 7. The ability to toggle between showing the numbers in entry sequence or number sequence. Although I have given this one a 5-star rating, there is still room for improvements, mainly along the lines of settings that are present in the web version but not here: 1. Remember that the timer has been turned off between games. 2. Turn off Undo includes cage combinations. 3. If playing on an iPad with a Bluetooth external keyboard, an option to use hardware keyboard entry instead of the app-specific onscreen keyboard. And one more request - Can we please have a version for Android? I have both an iPad and an Android phone, and I'd love to play this on both devices. ### 5/5 — My favourite game! *2020-12-05, version 1.5.2* I don’t often find myself paying for too many apps, but this game is wildly affordable and provides endless entertainment. 5/5 would recommend! ### 5/5 — Can’t down load the extra game *2020-12-02, version 1.5.2* Tried it on my iPhone and iPad and neither will let me down load the extra puzzles. What’s more, it tells me there is an error and will not let me cancel it. So I have to delete the app every time and reload it again. Good games, but useless app! ### 5/5 — Challenging *2020-11-29, version 1.5.2* Challenging and good value for money. The interface is easy to use ### 5/5 — Highly recommended! *2020-10-17, version 1.5* I’ve used this game for around 10 years. It’s always with me to while away time at airports, doctors, etc.. Extremely well designed and managed! Highly recommended! ### 5/5 — Totally addictive! *2020-10-02, version 1.5* I am totally addicted to this game! At first, I thought the easy level was hard. Now onto Extreme level, and determined to complete each puzzle without guessing. $1.49 for 100 puzzles will keep me going for a very long time. Love it! ### 5/5 — Brilliant *2020-08-19, version 1.5* 10 free games to get you started, then extras are only a penny each. No ads. Really useful functions for bifurcation, combinations and summing. The best that I’ve tried. ### 5/5 — Wonderful Math Brain *2020-08-14, version 1.5* The game makes you sharp thinking on a functional daily Math !! ### 5/5 — Well designed App *2020-07-23, version 1.5* The App is very well design and user friendly. It has all the tools for marking up each square - many nice touches. I am a relatively competent solver and the moderate puzzles takes around 40-50 minutes. ### 5/5 — Great puzzles *2020-04-23, version 1.5* Thank you... ### 5/5 — Perfect for all levels *2020-03-15, version 1.5* I just started learning this game mode a couple of days ago and I’m hooked. The easy levels are still kind of hard but helped getting used to the rules, medium is ok, hard is well hard and sometimes can only be solved through guessing haven’t tried extreme. You get 10 puzzles for free and have to buy more (I recommend the mixed packs). Only problem is a lack of tips and tutorials nothing mentions the 45 rule and the hints give a random number with no explanation apart from that great app. ### 5/5 — Perfect *2020-02-09, version 1.5* Great. Well crafted puzzles, and the interface has everything you need. Really great work, devs! The perfect killer sudoku app. ## Most critical reviews (10 lowest-rated) ### 1/5 — Wow! Straight into paying before knowing if it even works? *2020-04-13, version 1.5* First screen is straight up payment portal. Lots of good sudoku apps out there that give you a chance to assess before big $. Avoid this one. ### 1/5 — Bad controls few free puzzles *2019-10-06, version 1.4* The controls are bad for a sudoku game. Also there are only 10 free puzzles and no random puzzles. ### 1/5 — Multiple solutions . . . *2019-04-10, version 1.3* Extreme set #2, puzzle 63 has more than one solution - suspect others do, too. ### 1/5 — Not really free *2019-01-05, version 1.4* The app only includes 10 puzzles. More puzzles can be purchased for $0.99 a pack. Lots of ad supported versions out there. I’ll use one of those. ### 1/5 — Pencil marks don’t work *2017-11-09, version 1.4* No matter how lightly and briefly I touch a cell, it puts in the final number, instead of a pencil mark. Also, although it says that pen marks are disabled when multiple squares are highlighted this isn’t true. Unusable ### 1/5 — App frozen *2017-09-05, version 1.4* Won't open ### 1/5 — Jammed *2016-06-19, version 1.2.2* Have purchased 100 hard killer sudoku. Completed three and the app. has jammed. What has happened? ### 1/5 — Killer *2015-09-01, version 1.2.2* This game is ruined by the inability to hide game menu. Requires constant scrolling to see all parts of the puzzle. ### 1/5 — This app has no free puzzles *2015-05-02, version 1.2* No free puzzles. It tricks you ### 1/5 — Not even a single puzzle *2015-04-29, version 1.2* This app contains NO puzzles. You have to purchase ever single one. It is misleading to list it as a free app since you're any do anything without paying. ## Most praised reviews (10 highest-rated) ### 5/5 — Great *2026-07-04, version 1.5.3* Love this App. Possibly one of my most used. Simple clean no adverts. Possibly need a new pack but happy going back through the ones I’ve done ### 5/5 — Best I’ve found *2026-06-28, version 1.5.3* Quality puzzles, intuitive gameplay and doesn’t try to upsell you constantly. Therefore the only place I do killer sudoku. For reference I only do the toughest puzzles (not always successfully!) ### 5/5 — Best Killer Sudoku App on the iPad *2026-05-28, version 1.5.3* This is actually an app version of my favorite Killer Sudoku website. Most of the same features that make that the greatest website are present here, too, including: 1. Unique solutions every time! 2. Puzzle packs available for purchase at every level, including my level, the highest one, Extreme. 3. Most puzzles I've purchased are symmetrical, which is my preference. An exception is 100 Extreme Killer Sudokus #2. 4. The timer can be turned off. I never want my Killer Sudokus timed! 5. Pencil marks available, using the same keyboard. 6. An ability to check what's been entered, looking at the whole board. Unlike some other Killer Sudoku apps, it does not show in red a number that can't be correct based on what has already been entered, which I consider to be very distracting, even though some may consider it helpful. 7. The ability to toggle between showing the numbers in entry sequence or number sequence. Although I have given this one a 5-star rating, there is still room for improvements, mainly along the lines of settings that are present in the web version but not here: 1. Remember that the timer has been turned off between games. 2. Turn off "Undo includes cage combinations". In other words, if I am using undo, especially several steps' worth, I don't want my cage combinations reset. 3. If playing on an iPad with a Bluetooth external keyboard, an option to use hardware keyboard entry instead of the app-specific onscreen keyboard. And one more request - Can we please have a version for Android? I have both an iPad and an Android phone, and I'd love to play this on both devices. ### 5/5 — Ni-ice *2025-04-02, version 1.5.3* But want iPad version to have a left handed option! Haha ### 5/5 — Hard :) *2025-03-10, version 1.5.3* Definitely the hardest killer sudokus I've found so far in an app. Really have to use your brain and maths skills on this one. You only get 10 puzzles free then you have to buy packs, though 100 for £0.99 isn't bad. It's the same format as the Daily Killer Sudoku website which are all free. ### 5/5 — I really love this app! *2024-12-12, version 1.5.3* I use it every single day. It’s massively improved my maths skills, and it keeps my thinking fresh, whilst at the same time providing a perfect retreat. Thank you. One small thing.i have bought multiple packs from you - but having just had to reset to factory settings after getting my charger port replaced, they have all disappeared when i restored my ioad. Hiw do I retrieve my packs please? ### 5/5 — Great sudoku app with no tracking! *2024-01-28, version 1.5.3* I downloaded this app because it doesn’t track me or share my data. After playing the free puzzles for a while, I paid for a bundle of new puzzles because I really like the app. For me, this has everything I need from sudoku, with the right level of easy/hard and a range of options, all of which can be turned off or ignored so I can play how I want to. As someone with dyscalculia this is really appreciated. You can start each puzzle with no help at all, no “starter” cells filled in, or I can fill in some cells one by one until I am able to get started. This works even with easy puzzles. It’s a level of control over each puzzle I haven’t seen in other apps. The only thing missing for me that I’ve seen in other sudoku apps is the option to highlight all cells filled in with a particular number. As someone who struggles with numbers, especially with seeing all the same numbers, I’ve found that a really useful feature. But I get that most people aren’t like me! Thank you to the developer for respecting my data privacy. ### 5/5 — Variations *2024-01-22, version 1.5.3* I enjoy the problems, however, I do find that problems, which are supposed to be of similar difficulty, can take from as little as 30 minutes to over 1.5 hours, a small number never being finished but abandoned. I can spend/waste a lot of time every day on them! ### 5/5 — Best for experts *2022-10-29, version 1.5.3* I’ve bought all the 100 packs of hard and extreme puzzles in this app and can’t find another app to match this one for a challenge. This app demands skill with the numbers and sometimes it takes me 15 mins and sometimes an hour. I think I will have to buy the 500 pack although presumably there’s overlap with the 100s that I’ve already done. This app is also better in use than other apps: you can type number options in cells and select multiple cells. It also gives number options although I try not to use this. ### 5/5 — Top puzzle *2021-11-28, version 1.5.3* I’ve had this for a while now, I love it. It keeps me amused and still when I wake in the early hours until I’m ready to drop off to sleep again --- *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 2026-08-22.*