# Mahjong Duels Koo — Mahjong game for 2 players

> A 2-player Mahjong game with unique rules, strategic elements, and online multiplayer. (iPhone/iPad app by Cross Field Inc..)

- Source: https://appshunter.io/ios/app/mahjong-duels-koo/id6470430636 (this page in markdown: same URL + `.md`)
- Developer: [Cross Field Inc.](https://appshunter.io/developer/465034947)
- Category: Games, Board, Strategy
- Price: Free with in-app purchases
- Age rating: 4+
- Requires: iOS 15.0 · 282 MB
- Languages: American English, Japanese
- Released: 2023-11-17
- Data updated: 2026-08-19
- Monetization: free with in-app purchases
- User reviews in markdown: https://appshunter.io/ios/app/mahjong-duels-koo/id6470430636/reviews.md

## What is Mahjong Duels Koo?

Mahjong Duels Koo is a Mahjong application game for 2 players.
This free app offers an exciting original rule set that is different from traditional mahjong, allowing you to enjoy an exciting game of Mahjong.
Share the new Mahjong fun with players from all over the world.

■Features
・A strategy that is deepened by its own rules!
Based on traditional mahjong rules, the application adds unique elements to create a completely new mahjong experience.

・Easy to play with short term settlement!
The original rules, which use only Pin and Honor tiles, make it easier to form a winning hand than in regular Mahjong.
This shortens the time required for a game and makes it easier to play without stress.

・It is easy to get high-scoring Yakus! High-risk, high-return matchups
The original rule using only Pin and  Honor tiles guarantees that the hand will be at least Half Flush, and makes it easy to challenge Full Flush
This rule allows players to enjoy dramatic developments with high risk and high return.

・Original element "Shikigami"
Introduced the "Shikigami" skill, which further enhances the strategic nature of two-player games.
The strategy and reading of the game will be further expanded by the tactics used in various phases and the formation of the Shikigami.

・Heated Online Mode
With the Online mode, you can enjoy online battles with other players.
Aim for the top of the monthly ranking by accumulating victories.

・Gorgeous production
When Ron or Tsumo is played, the game adds a spectacular celebration of the player's achievement in the game. Each move is more vividly and dramatically colored.

## Key features

- Original rule set for unique Mahjong strategy
- Fast-paced games with short-term settlement
- Easy to achieve high-scoring hands
- Strategic "Shikigami" skill element
- Online multiplayer battles
- Monthly ranking system
- Gorgeous game production

## Pricing and in-app purchases

Base price: Free.

**One-time purchases**

| Purchase | Price | Type |
| --- | --- | --- |
| Coin2 | $5.99 | one-time |
| Coin3 | $29.99 | one-time |
| Coin4 | $59.99 | one-time |
| Coin1 | $1.99 | one-time |


## Recent user reviews (4 of 4)

All indexed reviews: https://appshunter.io/ios/app/mahjong-duels-koo/id6470430636/reviews.md

### 1/5 — 単純に面白くない。

*2026-02-13*

じゃんけんの方が楽しいです。

### 1/5 — 欠陥だらけなアプリ

*2024-09-07*

作った人はプログラミングも麻雀も知らない人なの？

・点数めちゃくちゃ
・ポンできる牌と出来ない牌が存在する
・リーチかけたのにかからない
不具合だらけでもう滅茶苦茶
麻雀以前にアプリとして成り立ってない

無駄なのでインストールしない方がいい

### 4/5 — 普通の麻雀との違いを感じる。四暗刻怖すぎ…

*2023-12-02*

実際、簡単に満貫以上が出てくる。そのため、点が普通の麻雀よりインフレしている。
また、役満が普通の麻雀より出やすいし、持ち点の関係上、役満を食らったら死んだとさえ感じる。特に四暗刻が出やすい。四暗刻の恐ろしさが普通の麻雀より大きい。ただ、そう言うスリルこそ、このアプリが提供してくれるのではないか。
あと、式神のスキルによって、この麻雀は普通の麻雀とは別物になったように感じる。
また、リーチしたときやリーチされたときにBGMが変わるのはすごい。緊張感が生まれる。

### 1/5 — やる価値なし

*2023-12-02*

デバッグが全くされてないと感じるくらい不具合が多い
やるだけ時間の無駄
リリースするなら最低限の動作確認はするべき

## Frequently asked questions about Mahjong Duels Koo

### What makes Mahjong Duels Koo different from traditional Mahjong?

Mahjong Duels Koo features an original rule set that uses only Pin and Honor tiles, simplifying hand formation and speeding up gameplay. It also introduces a unique "Shikigami" skill to enhance strategic depth.

### Can I play Mahjong Duels Koo offline?

The provided description focuses on online multiplayer battles and does not mention offline play capabilities. It is designed for competitive play against other users.

### How does the "Shikigami" skill work in Mahjong Duels Koo?

The "Shikigami" skill is an original element that further enhances the strategic nature of the two-player game. It expands tactics and reading of the game through various phases and Shikigami formations.

### Is Mahjong Duels Koo suitable for beginners?

Yes, the original rules make it easier to form winning hands and shorten game times, making it more accessible and less stressful for new players compared to traditional Mahjong.

### Does Mahjong Duels Koo have ads?

Yes, Mahjong Duels Koo contains advertisements, as indicated by the 'hasAds' flag.

### What devices does Mahjong Duels Koo support?

Mahjong Duels Koo is supported on iPhone, iPad, and iPod devices, as listed in the application data.

### How often is Mahjong Duels Koo updated?

The app was last updated on January 30, 2026, with version 1.0.9. Further update frequency information is not available in the provided data.

### What is the age rating for Mahjong Duels Koo?

Mahjong Duels Koo has an age rating of 4+, making it suitable for a wide range of players.

## Version history (last 5 releases)

### 1.0.9 — 2026-01-30

- fix a minor bug

### 1.0.8 — 2025-10-27

- fix minor bug

### 1.0.7 — 2025-05-08

- Fixed a bug in the online game.

### 1.0.6 — 2024-04-08

- Added practice game function
- Changed the time of the national game.
- Fixed minor bugs.

### 1.0.4 — 2024-01-24

- Changed so that matching can be started directly from the home screen.
- Changed the tutorial game.
- Fixed a bug.

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## More apps by Cross Field Inc.

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- [Classic chess](https://appshunter.io/ios/app/classic-chess/id1223231585)

All apps by Cross Field Inc.: https://appshunter.io/developer/465034947

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*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 2026-08-19.*