# Kurotto

> Binary determination puzzle game with circle-based logic rules. (iPhone/iPad app by Yuki Fujimoto.)

- Source: https://appshunter.io/ios/app/kurotto/id1141647313 (this page in markdown: same URL + `.md`)
- Developer: [Yuki Fujimoto](https://appshunter.io/developer/467085185)
- Category: Games, Entertainment, Board, Puzzle
- Price: Free
- Rating: 4.67/5 from 3 App Store ratings · 1 written reviews indexed
- Age rating: 4+
- Requires: iOS 7.0 · 14 MB
- Languages: English, Japanese
- Released: 2016-09-05
- Data updated: 2026-09-17
- Monetization: free
- User reviews in markdown: https://appshunter.io/ios/app/kurotto/id1141647313/reviews.md

## What is Kurotto?

Kurotto is binary determination puzzle game.
It's very popular in Japan.

Fill in the cells with the following rules.
・The number in a circle indicates the sum of the number of continuous black cells extending from it, vertically and horizontally. Empty circles may have any number of black cells around them
・Cells with circles cannot be colored

## Key features

- Binary determination puzzle
- Circle sum logic
- Continuous black cell counting
- Vertical and horizontal rules
- Unique Japanese puzzle mechanics

## Recent user reviews (1 of 1)

All indexed reviews: https://appshunter.io/ios/app/kurotto/id1141647313/reviews.md

### 5/5 — Beautiful game.

*2021-05-18*

That’s all that is needed.

## Frequently asked questions about Kurotto

### What is Kurotto?

Kurotto is a binary determination puzzle game. Players fill cells according to rules based on the sum of continuous black cells extending from circles, both vertically and horizontally.

### How do you play Kurotto?

You fill cells with black or white based on the number in circles. The number in a circle represents the count of continuous black cells connected to it, either vertically or horizontally. Cells with circles cannot be colored.

### Is Kurotto available on Android?

Based on the provided data, Kurotto is available on iPhone, iPad, and iPod. Information regarding Android availability is not specified.

### What is the age rating for Kurotto?

Kurotto has an age rating of 4+. This indicates it is suitable for children aged 4 and above.

### How often is Kurotto updated?

Kurotto was last updated on September 5, 2016, with version 1.0. There have been no updates since its release date.

### Does Kurotto have ads?

No, Kurotto does not contain advertisements. The app is free to download and play without any ad interruptions.

### What is the user rating for Kurotto?

Kurotto has a very high user rating of 4.7 stars, based on 3 ratings. This suggests a positive reception from its current player base.

### Can I play Kurotto offline?

The provided description does not specify whether Kurotto requires an internet connection to play. However, most logic puzzle games of this nature can be played offline.

## Version history (last 1 release)

### 1.0 — 2016-09-05

This app has been updated by Apple to display the Apple Watch app icon.

## Apps similar to Kurotto

| App | Rating | Price | Category |
| --- | --- | --- | --- |
| [Kurotto Extreme](https://appshunter.io/ios/app/kurotto-extreme/id1499171663) | 5.0 (1) | Free | Games |
| [Islands in the Stream](https://appshunter.io/ios/app/islands-in-the-stream/id571234122) | 4.6 (5) | Free | Games |
| [Hexicheckers](https://appshunter.io/ios/app/hexicheckers/id572058619) | 5.0 (1) | Free | Games |
| [ZammaApp](https://appshunter.io/ios/app/zammaapp/id6762573931) | — | Free | Games |
| [Chesshape: Paint Puzzles](https://appshunter.io/ios/app/chesshape-paint-puzzles/id6803892130) | 5.0 (1) | Free | Games |
| [Detective Grid: Clue Puzzle](https://appshunter.io/ios/app/detective-grid-clue-puzzle/id6800399939) | 1.0 (1) | Free | Games |

## More apps by Yuki Fujimoto

- [Thoroughly Freecell](https://appshunter.io/ios/app/thoroughly-freecell/id849017205)
- [Mahjong Tile Solitaire](https://appshunter.io/ios/app/mahjong-tile-solitaire/id892138094)
- [Thoroughly Sichuan](https://appshunter.io/ios/app/thoroughly-sichuan/id894399422)
- [Thoroughly Pelmanism](https://appshunter.io/ios/app/thoroughly-pelmanism/id896355967)
- [Four Leaf Clover](https://appshunter.io/ios/app/four-leaf-clover/id898621721)
- [Thoroughly Honkong (Mahjong Puzzle)](https://appshunter.io/ios/app/thoroughly-honkong-mahjong-puzzle/id901291989)

All apps by Yuki Fujimoto: https://appshunter.io/developer/467085185

---

*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 2026-09-17.*