# Thermo Sudoku — user reviews > 57 indexed App Store user reviews of Thermo Sudoku by Nick Carney, rated 4.80/5 from 145 ratings. - Source: https://appshunter.io/ios/app/thermo-sudoku/id1513994223/reviews - App overview in markdown: https://appshunter.io/ios/app/thermo-sudoku/id1513994223.md - Rating breakdown: 5★ 135 · 4★ 4 · 3★ 1 · 2★ 1 · 1★ 4 ## What do users think of Thermo Sudoku? Overall sentiment: mixed **Pros** - 👍 Well-made, challenging puzzles - 💡 Handcrafted, unique puzzles - 👍 Great logic and learning - 👍 Intuitive and beautiful interface - 👍 Excellent user experience - 👍 Hints explain logic, not just answers - 👍 Good for brain exercise - 👍 Smooth performance - 👍 Worth the price **Cons** - 🐛 Timer glitch/inaccurate tracking - 🐛 Awful controls - 🐛 Clues sometimes illogical - 🐛 Puzzles too hard/convoluted - 🐛 Locked puzzles behind easy ones - 🐛 Multiple solutions in puzzles - 🐛 Old menu design preferred - 🐛 Keyboard navigation incomplete - 🐛 Erase function unreliable - 🐛 Number pads too small - 🐛 Themes not ideal **Commonly reported bugs** - Timer adds incorrect hours/minutes - Timer adds 44 seconds when notifications are pulled down - Timer jumps when exiting/re-entering app - Wrong number put into box when leaving and loading app - Clues do not stand up to logic - Controls are bad - Erase function does not work as expected - Keyboard navigation incomplete - Arrow keys often don't register - Puzzle 24 impossible without cheating - Multiple solutions found in puzzles **Most requested features** - Fix timer glitch - Improve controls - Ensure logical clues - Add more puzzles - Unlock all puzzles - Improve hint clarity - Add synchronization across devices - Improve keyboard navigation - Add split view mode - Revert to old menu design - Allow reading hints while viewing board - Grey out used numbers - Improve erase function - Offer a theme similar to Chess Sudoku ## Newest reviews (10 of 57) ### 4/5 — Nice Sudoku app (with one small flaw) *2024-01-26* While the app comes with “only” 100 Sudokus, all of them are very well made. Even the easy ones take a few minutes to solve and the hard ones may even keep you busy for an hour or more. I found the puzzles to be challenging but fair. My only complaint is, that with the latest app version running on iOS 17.2 the time tracking seems to be somewhat broken, sometimes adding hours to the recorded solve time. When locking the phone while a puzzle is open, chances are, that a few extra minutes will be added to the timer _after_ unlocking the phone (you can see the timer change in one big step). The difference is also much bigger than the time the phone was locked and can quickly add tens or hundreds of hours within a a few minutes. It seems to be somewhat dependent on the pre-lock value and not really linked to the lock time; the bigger the time the more time gets added. The highest change I observed was 980 added hours within a 5 second screen lock. Which is also why the app tells me, that it took me just over 40000 hours (4.5 years) to solve level #100, which was released less than two years ago… ### 4/5 — Timer glitch *2023-05-31* On iPhone, whenever playing a level on the screen if I bring down my notifications sliding down from the notch and then back up to return to the game, a 44 seconds gets added to the clock on the level; 100% of the time, same 44 seconds extra. Other than that great game. ### 4/5 — Excellent Puzzles but… *2021-09-08* A marvelous collection of puzzles but most are locked which requires completing the easy ones to unlock more puzzles….WHY? I PAID $4.95!!! It’s the least logical part of the app. Remove the locks ASAP. ### 4/5 — Great app, but unique solutions not guaranteed. *2021-02-20* I have now discovered two different puzzles with multiple solutions. The first one was easy to find the right solution, but the second one is less straightforward. ### 4/5 — Bad update *2020-11-08* Love the content of this app, but I liked it more before the latest update. The look and feel of this new version seems like a step backwards from what it was before. The actual gameplay is great and unchanged from previous, but it’s the menu layout that I find unsatisfactory. Ultimately not a huge deal, but it’s frustrating when it was fine as it was. ### 4/5 — New puzzles *2020-09-25* Love the puzzles, wish it was updated and puzzles were added more regularly. ### 5/5 — Love the app *2020-07-23* My only problem is I have finished all 40. When is the update? ### 4/5 — Awesome puzzles but app needs a bit of improvement *2020-07-22* The only two things I can complain about are: 1. in landscape mode on iPad Pro 11“ the controls for the menu etc. are out of reach, please fix that 2. there’s no split view mode for the app, please add that I‘m really looking forward to the new puzzles in the future! ### 4/5 — Very good , more levels needed *2020-06-27* Such a fun app but I finished so easily, more levels need to be added especially because we’re paying:) ### 4/5 — Synchronisation *2020-06-23* I hope you’ll add it some day. I’d love to play on both of my devices. Besides that an amazing app. Love sudoku ❤️❤️❤️ ## Most critical reviews (10 lowest-rated) ### 1/5 — Haven’t followed through on promise *2022-03-01, version 1.3* Still waiting for the last 20 puzzles that were promised. Been at 80 for a while ### 1/5 — Broken Promise *2022-01-31, version 1.3* The app description says it will be enhanced to 100 puzzles within a year of introduction. It has now been over 20 months and we are still waiting. ### 1/5 — App Falls Short on Promises *2021-10-24* It’s been well over a year and this app is still 20 puzzles short of the “100 puzzles within first year” promise upon launch. And, yet, the developers are releasing new games with similar promises. PLEASE keep your promises to people who bought your game at launch and release the remaining puzzles for this app. ### 1/5 — Too tedious having to do all the easy puzzles before having access to the good ones. *2020-07-25* I love thermo sudoku and Cracking the Cryptic. Was looking forward to lots of thermos. But it’s not fun solving a couple of thermometers easily and then just having classic sudoku left to solve/fill in before you can progress to a more complex one. Didn’t even complete the first puzzle—too boring. The others might be good, but I’ll never know because the app won’t let me access them. I wish I could access them! Would love to give 5 stars! ### 2/5 — Awful controls *2023-05-05* The controls are so bad as to make it almost unplayable. Why not use the same number pad as Cracking the Crypto? If you fix this, i’ll change my rating to five stars. ### 2/5 — Starts out great but clues don’t make sense after a while *2022-04-05* This plies to all apps by the developer. When I get stuck on a puzzle and check the clues, it will say something like, “8 can only go in c7 in r2,” which doesn’t stand up to logic when it can clearly go in several other rows. I check it with someone else and they agree that the clue is wrong. It’s otherwise a good quality app, and the puzzles are mostly very good, but there are some glaring failures littered through the app. When the idea is to methodically solve a puzzle, it is frustrating when the next step defies all logic. There are several ‘logical leapfrogs’ across the series of apps. ### 3/5 — Good, but some polish still would be good *2021-04-14* Lovely puzzles, in a good app. Nice to see the “smart hint” option appearing, but in my testing most of the time they’re not very smart, suggesting things I’ve already spotted. Some niggles preventing 5 stars: - when all of a particular number are placed, many Sudoku apps (including some of your other ones) grey out that number from the available selection. This app doesn’t. - the navigation around the parts of the app is not easy to understand. I got quite lost try to get back to the game from the settings menu (which would be a more obvious name than Gameplay) - when you go to the gameplay settings and back to the current game, all the move history is lost, so you cannot undo - the erase function never works like I expect it to. - keyboard navigation incomplete, and arrow keys often don’t register. Should be like the web app from CTC which can do everything by keyboard. BTW, you only have 2 months to publish another 20 levels, to keep to the promise you made on launch. ### 3/5 — Too hard *2021-04-13* I really enjoy doing sudoku on this software, and I enjoy the Thermo puzzles, up to the point where they get too hard. Puzzle #79 is ridiculously hard. I got as far as could, starting looking at hints and could not get past the fourth hint, i understand what it’s trying to say but it doesn’t fit the puzzle and no progress can be made from this hint unless you just take it on faith you should remove the candidates it says to. I think if people want super hard puzzles they can find them on their own, no need to include such convoluted logic in a mass marketed app. I have had this trouble with other cracking the cryptic apps too, the last few puzzles are just stupid hard and make me wanna shoot myself in the head ### 3/5 — Cool Variant *2021-02-25* Very cool variant of Sudoku. Comfortable app with very nice possibilities to do remarks. I like it! Can‘t wait for releasing additional level! Update 25. Feb. 2021: Currently only 60 of the promised 100 puzzles are available. When will you release the next puzzles? I still love this app. ### 3/5 — Great, but.. *2020-11-05* It is an amazing game with great puzzles. I really recommend it. But, like I already wrote about the classic sudoku: I like the old menu design way more than the new one. Also, it is annoying that the sorting method always resets. ## Most praised reviews (10 highest-rated) ### 5/5 — Brilliant *2022-09-14* Rich in customizable features and lovely, handcrafted puzzles :) Thanks for your efforts in creating these lovely apps, and the YouTube channel. ### 5/5 — Bug: Timing Error *2022-08-17* Great app, but sometimes when exiting and re-entering the app while solving the puzzle, the timer jumps, sometimes hundred of minutes at a time. I didn’t have this error on the Classic or Chess sudoku app. ### 5/5 — Love this app but 1 really annoying bug *2022-01-15, version 1.3* Love Cracking the Cryptic youtube channel so i had to get 1 of their apps. These puzzles are a lot of fun. My only issue is that there is 1 weird bug that can be quite annoying. Whenever you leave the app and load it back up, there is a wrong number put into box where you left off. Happens almost every time. Normally if this happens without resetting the app, you can just hit the undo button. ### 5/5 — Awesome *2021-06-19* One of my favourite type of puzzles on ctc, and so glad they released this. p.s puzzle 24 is impossible to solve without cheating. ### 5/5 — Thank you Simon from YouTube *2021-06-15* Only got this as it was recommended by Simon the cryptic guy. Great app very please ### 5/5 — Amazing fun and good for learning *2021-05-16* Easy to use app with plenty of puzzles, most are more difficult than easy but all are well constructed with replay value. Took me forever to do some but got there I. The end, will certainly but the others as well! ### 5/5 — Incredibly fun and entertaining *2020-12-16, version 1.2* Loved playing these! I wish the hints were a bit easier to understand but otherwise a great app! ### 5/5 — Awesome app, terrible update *2020-10-30* This redesigned level select menu is so much worse than the older one! No one needs to sort the levels, and to scroll down to last levels is annoying. PLEASE, stop with classic and this app and don’t bring this menu to your other apps((( PS love the apps with the bottom of my heart and Saimon too) ### 5/5 — Absolutely My Favorite App *2020-08-01* I love this app so much. I check almost daily for an update. Thermometer Sudoku is definitely my favorite variation and I cannot get enough of it! Update day is always highly anticipated. Every Cracking the Cryptic app is wonderful. I own all 4 and have completed every puzzle published on each to date, but in my heart none of them can compete with Thermo. I find myself frequently going back to already solved puzzles to solve them again. I also really love that the hints don’t just fill in a number but rather explain the logic behind each move so you can learn to solve it. The latest update had the most beautiful puzzles yet. They were truly breathtaking and gorgeous to solve. All my love to Mark, Simon, and the team behind this app. All parties involved are breathtakingly talented. ### 5/5 — Really enjoyed doing all the puzzles! *2020-07-27* Just finished the 40 puzzles. Enjoyed the tough ones - got really stuck on 39, and it was quite satisfying to finally have a breakthrough. Loved whiling away the time on this over the last month. Looking forward to more puzzles. Love the clean interface. --- *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 2026-08-31.*