Killer Sudoku CTC Game Reviews

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Fantastic App. Great utilities for figuring out possible combinations. Great UI (the corner notes don't cover up cage totals like in your web app. Only one nitpick, I seem to have a different difficulty scale than you guys. The first puzzle, rated one star, took me just over 50 minutes because I just couldn't see the logic of summing 8 of 9 boxes in a row to get the remaining digit. Stairs (puzzle 10), rated five stars, only took me 15. If you overlook my weird mind thing overlooking easy logic, it's a great app with straightforward to absolutely fiendish puzzles. Highly recommend the app and the YouTube channel if you are somehow unaware of it's existence.

Love it. I love everything Cracking the Cryptic puts out. Not only are the puzzles fun to play over and over, but their “hints” are also great at teaching how to be better at the puzzles.

App makes it too easy. I am blown away by the little calculator that adds up your cage totals and tells you how many possibilities there are, coupled with all the highlighting (I have a lot of the features turned off, including highlighting errors and restricted cells) this app seems like does the puzzle for you, if I had all the features turned on it just about would! Good luck going back to pen and pencil sudoku after using this app! The software they use on YouTube and the software you get to use when you play those games seems antiquated by comparison to this software. Overall this is not a complaint, I like this software but I am losing my scanning skills as a result of using it

Top Notch. I really appreciate all of Cracking the Cryptics sudoku apps, and this is one of my favorites. I enjoy that the puzzles in the beginning teach you the particular logic that you’ll need for more challenging puzzles (like how the first puzzle teaches you to use The Secret). One aspect I really like is the app does a lot of accounting aspects for you, like giving you possible combinations for a given killer cage along with a calculator, plus automatically removing pencil marks that a placed digit interacts with. That is the developers respecting the intelligence of the solver; the challenge is deductions, not getting buried under your pencil marks or petty arithmetic. Top notch app, hats off to the setters who contributed and the development team.

Nice puzzles, needs cloud sync. I’m enjoying the difficult puzzles so far! I hope they can add cloud sync feature to the app so I can pick up the game between my iPad and iPhone. The pass phrase system is not very convenient and Apple provides a mechanism for apps to sync. It would be greatly appreciated!

Tough but excellent puzzles. A great app for when I’m looking for a really tough puzzle to chew on for an hour. One of the few puzzle apps where I don’t feel too guilty about resorting to a hint now and then. Or if eight or nine minutes go by and I can’t find a logical deduction that’ll move me forward, the app makes it possible to make a guess as to a digit in a particular box and see where it leads. I color the box before I make my guess as to its contents, so that if I reach a contradiction, I can quick undo my moves until the color disappears and I’m back where I started. Very handy. Speaking of hints, though, the first hint in puzzle #22 is in error. One suggestion: When one taps on a box, all the other boxes that that box “sees” are shaded. I’d find it helpful if the other boxes within the same cage could shaded in a slightly different color.

Mostly Fun, few rough edges. I’ve really been enjoying this app. It is well made and the puzzles range from easy to very difficult. I’d mostly recommend this. My biggest “complaint” is the hint system. Smart hints are nice, but often will tell me things I already know. “Regular” hints… well they use a lot of jargon and state things that are not obvious and give free explanations. Some puzzles are better than others, but as the difficulty ramps up I’m finding the hints harder to follow. The hint may say these four cells need to be a 6/7/8/9 quadruple or that these two cells must add up to 4, but I have no idea how they got to those limitations. As such, I’m not learning any new strategies. (And sometimes the hints are leave me completely confused.) I did get this app a second time on my android tablet so I could play on a larger screen. Currently the syncing function will sync or merge progress, but it does set your completion times to 999:59 for all your puzzles. (Or at least it did for me.)

Unusable after last update. Love the puzzles in this app, but after the last update, the app is unusable in landscape mode (iphone 13 pro max). Clues are automatically displayed and when they are, they're just a tall and skinny column that you can't even read. It's a small bug that completely destroys the app's usability.

Great Killer Sudoku app. Love this app, really challenging but fun killer sudokus to play! Only criticism I have is adding new puzzles. Hoping for more puzzles to be added but love it regardless. Let’s get cracking!

Overwhelmingly Beautiful. I never take the time to write reviews for apps, because there is usually not enough motivation for me to. However, there are so many great things about this app that I felt this app deserves to be known for. The puzzles. These are not computer generated, run of the mill puzzles. There is always something very neat about puzzles set by a human, and the developer for this app knows that. The logic is always satisfying to discover. The challenge of the puzzles is also at a good level: for those who have never seen this sudoku variant before, it may be tough, but for those who have seen one or two solves, these puzzles (at least the first five or so) won’t kill you. A good way to get into them, I say. I know with this app that when I click on a puzzle, I will be getting an interesting logical stimulant that has a gorgeous solution. The design. This app is made by people that solve puzzles every day and love them. They know what feels good in a sudoku design and what doesn’t. The settings also allow you to choose how much of the note taking and number filling the computer does for you. No ads in sight (but that would be silly on a paid app). The cost. For the amount of work it takes to put together this level of a sudoku app, $5 is more than reasonable. It doesn’t hurt that these developers are on round 6 of sudoku apps and know exactly what their consumers expect for five dollars. In short, there is no better killer sudoku app out there. This one is fresh and stimulating. This is the perfect gift for a holiday season, for yourself or for others. I cannot recommend it enough. Thank you, CTC!

Difficulty curve too steep. One thing I’ve liked about the CTC apps is that they generally have a pretty gracious difficulty curve where you slowly get introduced to more concepts relating to the sudoku variant. Consequently, I’ve found it a bit harder to develop an intuition for this one. I felt almost completely lost after the first few. Of course I’m still learning, but I’ve had to view the hints quite a bit. I think for example after you get the 12 cage in puzzle 5 the logic is quite accessible most people would be able to figure it out. However getting that cage is a multi step process where you have to look quite a bit ahead to understand. I definitely don’t think that deserves to be a 3 star puzzle for that reason.

Another brilliant Cracking the Cryptic app!. So glad to finally have another amazing app from my favorite YouTube channel. I’ve been addicted to Simon and Mark for the past several months, and I love getting to solve these puzzles. I appreciate how similar to the Sandwich Sudoku app, this one provides all possible combinations of digits when you click on a cage. This is especially helpful for those of us who aren’t as quick witted as the CTC geniuses. If you take requests, I would very much love a Kropki and/or XV app!

Delightful Learning. The utilities in this app along with the beauty of the puzzles make it perfect for me to grow in my sudoku solving skills. I can practice more of the solving techniques seen in the CTC videos. It is a joy.

Another great entry with good app improvements. I’ve been a big fan of the Cracking the Cryptic apps, and this one is the best iteration so far. The author line up is great with Christopher Seeliger leading off the puzzles. The killer cages are easily visible, and the themes are a good mix of colors. Like the Sandwich Sudoku app, there is a column to show possible combinations in cages for those of us who struggle with mental math. There are 40 puzzles to start, which I think will keep most solvers busy for a bit. The only downside was I was hoping there would be some little killer puzzles, but it doesn’t look like there are any. That’s a bit of a nitpick since that was never really promised, but it would have been fun to see since combo killer-little killers are quite fun. In case case, this is well worth the money. Another great addition to the CtC app collection.

Not your average killer sudoku. Killer sudoku is my favorite sudoku variant, and when I heard Cracking the Cryptic was releasing their own app, I was thrilled. As with their other apps, every single puzzle is hand-crafted and tested, and the creators themselves have written a series of hints for each puzzle that not only help you find the next step if you’re stuck but actually teach you techniques to improve your skills. Every puzzle in this app is absolutely extraordinary. They’ve been constructed by some of the world’s best setters. This is NOT your average killer sudoku. The logic involved is unique and exciting to find. Plus, the app has every feature I could ask for in a sudoku app: double notation, your choice of error-checking options, the ability to highlight and color, undo and redo. And specific to killer, it will add up cage totals for you, and it gives a list of all possible combinations for a given cage, and has a calculator for you to test other combinations. It’s a magnificent app, and well worth the $5. My only real complaint is the occasional typo in the hints, but it hardly mars the overall experience. Also, if there were a way to view the hint and the grid at the same time, that would be helpful.

A shame it’s not the top result when searching for Killer Sudoku. CTC sudoku apps are the only sudoku apps worth installing. High puzzles and apps, should be the first (and only) stop you make when looking for new puzzles to try

Amazing puzzles. The quality of each and every one of these hand crafted puzzles is superb. I look forward to the next update!

Beautiful! And a request.... All of CTC's Sudoku apps have beautiful puzzles and excellent tools. My only request for their Killer (and Sandwich) Sudoku is to include list exclusion (in the given lists of sums) in the undo stack. I will often run aground and need to undo myself back a bit, and I lose my thread of deduction when the lists I've grayed out don't revert. If this is a known challenge for UX (it might appear that nothing happened), I would suggest showing (and flashing?) the sums panel when undoing those exclusions. I give it 5 stars regardless, but knowing how thoughtful they are I thought I would offer this request for future updates!

Love this app!. The calculator is awesome and the list of choices that you can filter helps so much. I hope that more puzzles are added soon!

Is it possible to reset the puzzles to play them again?. Love the app, but can’t find a way to reset it and start over again

Great layout, but some of the puzzles are poorly rated.. Best interface of any killer sudoku app on the market. Big problem, though. The puzzles authored by “Cracking the Cryptic” are much more difficult than puzzles rated similarly by other authors. Since this was developed by CTC, it would seem that they are not good judges of their own puzzles. It leads to random difficulty spikes that are frustrating for players like myself just learning the ropes.

Good puzzles, terrible help. The puzzles are well designed and extremely challenging! Unfortunately, if you’re not as smart as the Cracking The Cryptic crew, the in-game hints often seem to be focused on conserving space over explaining their logic, which often leads to hints asserting facts not in obvious evidence, which doesn’t help the user understand what they’re doing wrong.

The perfect sudoku app!. Killer sudoku are IMO the best variant, due tom the sheer variety of logical techniques the setter and solver can explore. These puzzles are really fantastic. Every one is thoughtfully crafted, each infused with a delightfully unique structure and narrative. The puzzle interface is simple but effective, with a sophisticated hint system designed to teach new solving techniques. All in all this app feels like a labor of love. Couldn't recommend it more highly.

Awesome addition to CTC collection. Fantastic app! Easy to use and lots of options to customize the gameplay. Puzzles are TOUGH, but each has a set of helpful hints that teach you tricks to learn from.

Beautiful app, not so good puzzles. The app is beautiful, however I don’t like the puzzles so much. Most of them require brute force solving. By that I mean you have to take a guess and keep going until you hit a contradiction, then you guess again.

Another Killer App - Puzzles do not get better!. These are the best Killer Sudoku puzzles you will ever solve. They are not created by an algorithm like so many apps, these are hand crafted by some of the best sudoku setters in the world. Each one takes you on a journey where you discover new tricks and ideas. The interface is great, the hints are very strategic and handmade as well. Just 6 months ago I was not aware of the world of handcrafted Sudoku puzzles. Now, because of the Cracking the Cryptic You Tube channel, I can’t get enough. Keep it up guys!

Deliciously difficult. Wonderfully challenging games that will keep you binge playing for hours

Like it!. Great sudoku app with many well thought out puzzles. One knock is how battery draining the app seems to be. Maybe chosing to build something this simple on Unity was not the right choice?

Great puzzles, Sometimes hints are not understandable. I enjoy Cracking The Cryptic variations on Sudoku puzzles and spend more time than I’d like to admit playing them. Sometimes when playing the more difficult puzzles, I look to the hints to get insight as to how to solve them. Many times, the hints are vague and do not help to understand the step. I get that it may be text length limited but if it doesn’t help, why bother. Keep making these puzzles while trying to help with better hints for solutions.

Not quite there yet. I’m sure the quality of these puzzles is excellent, and I look forward to trying them once the app receives a key improvement. Current the corner pencil marks do not display in the same location in various cells depending on whether or not the cell contains a cage total, making it much more difficult to scan the grid and much less satisfying to use the app. I will be happy to update my review and increase my star rating once this is fixed, but at present I cannot recommend the app.

Game#2 has bad cages that can’t be solved. Lower left square has 3 cages with one space left and yet the total is already 45. So can’t solve puzzle 2, which is required to get enough stars to move to puzzle 3. Checked for updates to fix problem but none available.

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What’s an outie?. How about another option under the settings for an explanation of terms. I’ve googled ‘what’s an outie in sudoku’ and nothing comes up.

Nice, but some improvements needed for better UX. Some useful features: - show the last hint in a small window, so we don't have to navigate forward and back between the hint and the board. (There is unused vertical real estate at the top of the screen) - row and column numbers, so that it's faster to find which row is which for the hints - better themes -- would love a darker dark theme (similar to iOS default dark), or even amoled dark - bigger buttons! It's really hard to press 1-9 properly because the buttons are so small. A mode / layout similar to daily killer sudoku would be really great

Lovely puzzles. Love these hand-crafted puzzles though the hard ones are very hard indeed, at least for me.

Waiting. Great games and definitely learnt a lot of new tricks to apply in sudoku. Only wished more levels are released soon as I’m going to forget the tricks or will end up deleting the app after a prolonged period of not playing.

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The best!. Hands down the best sudoku app I’ve ever used! Easy, intuitive, and fun!!!

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