Kakuro u

Kakuro u

Classic Math Logic Puzzle Game

294 ratings
125 reviews
Free
In-App PurchasesWith Ads

Details

  • Released
  • Updated
  • April 23, 2009
  • March 15, 2026

Features

Kakuro u screenshot #1 for iPhone
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Kakuro u screenshot #10 for iPhone
iphone
ipad
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About

Engage in a classic math logic puzzle game that offers a challenging and addictive experience. Explore a vast number of puzzles with unique features designed for daily brain training or relaxation. Progress through difficulty levels and master complex number combinations.

Unlimited Kakuro puzzles
Puzzle generator
Bookmark and 'Ball of String' function
Combo calculator
Color-coded entries
Multiple hint types
Six difficulty levels and board sizes
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What users say

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What's New in Kakuro u

3.29.01

March 15, 2026

Minor bug fixes. Updated SDK.

Subscription plans

Monthly Pro Subscription

Subscribe to Pro to enable advanced features.

$0.291 Month
How to cancel Kakuro u subscription ⁉️
5

In-App Purchases

$1.99

Purchase Kakuro Outright

Purchase Kakuro Outright. One off purchase.

User reviews

Glitchy but great

I’m giving only 4 stars because… I’m not sure this game is even playable without a paid account at the moment, because of bugs in the way IAP and ads work. Which I know because my paid account somehow turned into a free one in a previous update. They manually restored it for me, which is very cool, but obviously it would be better if it didn’t happen in the first place. And there have been a few times over the many years where the game just didn’t work for months (e.g., way back when, IIRC, the iPhone 6 came out, it couldn’t handle the extra screen space and would crash if you clicked there). Of course most games from that long ago were just abandoned and won’t work on anything newer than iOS 9 or something, so not having this game for a few months every few years is not a huge tragedy by comparison.

But once you get past that, it’s as great as it ever was, and miles ahead of any other Kakuro app I’ve found.

It can generate puzzles that are genuinely difficult but not unsolvable—the only other apps that have any difficult puzzles have a small number (and often charge you for them) rather than an endless stream of new ones. And the whole UI is designed around assisting you in solving those difficult puzzles. It’s a little messy and maybe hard to figure out at first, and kind of ugly (and changes over the years have made it uglier). But as far as usability once you learn it, it’s amazing.

Also, it doesn’t hide behind a bunch of irrelevant gamification features. There’s counts of how many games you’ve won and a few other little things, but no big 30-second celebration when you win or coins to grind for or cheats to ration or special event modes or any of that. If you enjoy Kakuro as a game you don’t need them, and if not, they won’t help, so this app doesn’t have them.
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Ruined by updates

A previous update to this game has turned what was the best kakuro app for almost a decade into a borderline unplayable mess. And the next update took away features while changing nothing else. And the latest one makes it unplayable. You can’t even start a new game, because all the difficulty levels have weird labels about ads instead of being level numbers, and then, when selected, they each give some different error about some GDPR service. So, that’s that; I can’t play even if I wanted to. But I rarely wanted to anymore anyway, for quite some time. Here’s my review of the previous changes to explain why: First, the new color scheme and “flat” look is hideously ugly. It’s also less usable—a touch interface with tons of fiddly little buttons crammed onto the screen really needs visible borders. (Imagine the iPhone keyboard without the white squares around the keys.) Second, there’s now a banner ad on the bottom, right where you want to click to unselect the current selection. For a game that I paid for (even if the paid version was merged with the free version a few years ago), this is especially unacceptable. Third, it now randomly pops up intrusive ads. Worst of all, it keeps trying to get me to pay for a “Pro” upgrade. (I have no idea what’s included in “Pro”, but whatever it is, I haven’t needed it for the past decade.) It sometimes even spontaneously triggers a payment confirmation that I have to cancel. Presumably the interface tricked me into clicking a “Upgrade” button that appears under my finger when I’m trying to click something else, or something like that. But however they’re doing it, it’s not just seriously unethical, and annoying, but also a serious violation of Apple’s rules. So, what improvements do we get to compensate for all these downgrades? Not a single one of the features people had requested over the past decade (like an easier way to mark the board and rewind to an earlier mark) has been added. They did finally fix the bug where, on any screen bigger than an iPhone 4, there’s a dead space on the top and bottom that can crash the game if you accidentally click it. But because they filled that dead space with a banner ad that pops open an ad page in Safari if you accidentally click it, this isn’t really an improvement. I wish I could go back to the previous version. A new version came out at some point, and I upgraded hoping it would solve some of the problems. But I’ll never find out, because it disabled enough features that it’s not worth even trying. You can’t even start a game above medium difficulty anymore. So now, it’s gone from a game I pick up every once in a while when I’m not too annoyed to deal with the frustrations to one that I will never even think about playing. Nice job ruining it for good.
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Response from developer

Hello, please email support@thechesssolitairesudokufactory.com so that we can get you back your paid for version.

Kakura

Love this game, keeps you thinking.

No hard levels

Please reinstate the harder levels !!!

Better options out there if they are not re introduced

Ruined by updates

The previous update to this game has turned what was the best kakuro app for almost a decade into a borderline unplayable mess. And the latest update takes away features while changing nothing else. First, the new color scheme and “flat” look is hideously ugly. It’s also less usable—a touch interface with tons of fiddly little buttons crammed onto the screen really needs visible borders. (Imagine the iPhone keyboard without the white squares around the keys.) Second, there’s now a banner ad on the bottom, right where you want to click to unselect the current selection. For a game that I paid for (even if the paid version was merged with the free version a few years ago), this is especially unacceptable. Third, it now randomly pops up intrusive ads. Worst of all, it keeps trying to get me to pay for a “Pro” upgrade. (I have no idea what’s included in “Pro”, but whatever it is, I haven’t needed it for the past decade.) It sometimes even spontaneously triggers a payment confirmation that I have to cancel. Presumably the interface tricked me into clicking a “Upgrade” button that appears under my finger when I’m trying to click something else, or something like that. But however they’re doing it, it’s not just seriously unethical, and annoying, but also a serious violation of Apple’s rules. So, what improvements do we get to compensate for all these downgrades? Not a single one of the features people had requested over the past decade (like an easier way to mark the board and rewind to an earlier mark) has been added. They did finally fix the bug where, on any screen bigger than an iPhone 4, there’s a dead space on the top and bottom that can crash the game if you accidentally click it. But because they filled that dead space with a banner ad that pops open an ad page in Safari if you accidentally click it, this isn’t really an improvement. I wish I could go back to the previous version. A new version came out at some point, and I upgraded hoping it would solve some of the problems. But I’ll never find out, because it disabled enough features that it’s not worth even trying. You can’t even start a game above medium difficulty anymore. So now, it’s gone from a game I pick up every once in a while when I’m not too annoyed to deal with the frustrations to one that I will never even think about playing. Nice job ruining it for good.
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Developer apps

User experience

🐞

Reported Bugs

5 issues

Glitchy, crashes often

Bug

Doesn't work on iOS 8

Bug

Doesn't work anymore after updates

Bug

Buttons don't respond

Bug

Loses progress when app is interrupted

Bug

Requested Features

3 requests

Easier way to mark the board and rewind to an earlier mark

Feature

Dark mode option

Feature

More hints for beginners

Feature

FAQ

What is Kakuro u?

Kakuro u is a mathematics and logic puzzle game, also known as cross sums. It is similar to Sudoku but includes an additional twist. The app offers a powerful and feature-rich mobile experience for this classic puzzle.

What are the key features of Kakuro u?

Key features include unlimited puzzles, a unique puzzle generator, the ability to set bookmarks, a 'Ball of String' function for exploring solutions, a combo calculator, color-coded entries, multiple undo options, and various hint types. It also offers six difficulty levels and board sizes.

How does the subscription work?

Subscriptions are related to the Kakuro Pro service and offer access to additional features. Payments are charged to your iTunes account upon purchase, and subscriptions automatically renew unless turned off at least 24 hours before the current period ends. You can manage subscriptions in your account settings.

What are the common use cases for Kakuro u?

This app is ideal for daily brain training, offering a challenging mental workout. It can also be used for relaxation by engaging in a satisfying logic puzzle. Players can work their way up from beginner levels to become a Kakuro Master.

Is Kakuro u compatible with my device?

While specific compatibility details are not provided in the description, the app is designed for mobile devices, specifically mentioning iPhone. It's recommended to check the app store listing for precise device and operating system requirements.