# Mahjong Demon — Japanese Mahjong

> Digital Japanese Mahjong game with strategic hand-building and discard mechanics. (iPhone/iPad app by NUTRACTOR.)

- Source: https://appshunter.io/ios/app/mahjong-demon/id321109246 (this page in markdown: same URL + `.md`)
- Developer: [NUTRACTOR](https://appshunter.io/developer/305620719)
- Category: Games, Entertainment, Board, Card
- Price: $1.99 (on sale, was $2.99)
- Rating: 4.80/5 from 85 App Store ratings · 70 written reviews indexed
- Age rating: 17+
- Requires: iOS 15.0 · 123 MB
- Languages: American English, Japanese, Chinese (Simplified, China), Chinese (Traditional, Taiwan)
- Released: 2009-07-06
- Data updated: 2026-09-06
- Monetization: free
- User reviews in markdown: https://appshunter.io/ios/app/mahjong-demon/id321109246/reviews.md

## What is Mahjong Demon?

This is a Mahjong game of the Japanese style rule.
The Slider that exists under the screen is moved, and the tile is selected. 
And, the Slider is done in the tap and the tile is discard.
Mahjong is the game to finish four Melds and one Pairs.

Example: [1, 2, 3][6, 6, 6][6, 7, 8][N, N, N][4, 4]

However, there is a hand not approved when Chi, Pon, and Open Kan.
Please note whether there is a hand when you do 1 and 9 in Chi and Pon.
In the rule of the japanese mahjong, one or more hands are necessary.
The hand can be made by paying 1,000 points and doing Reach.
However, when Chi, Pon, and Open Kan are done, Reach cannot be done.
If it is a closed hand, high point will be obtained.
About Lost Hand. A hand that is Waiting, but cannot be won off someone else's discard due to the fact that the owner of the hand already threw a winning tile in their own discard.
Lost Hand if one in all winning tiles are here even if discard doesn't do the tile which it wants to do. But, self-draw is possible even with Lost Hand.
The knack is that Ron is never done by the other party.
Ron is never done with the tile that does Discard.
Please reason the Hand from other party's Discard and win.

## Key features

- Japanese Mahjong rules
- Tile selection slider
- Discard functionality
- Forming Melds and Pairs
- Understanding "Chi," "Pon," and "Kan"
- Reach mechanic for scoring
- Lost Hand rules

## Chart rankings

- #145 in Top Paid · Board (US App Store)
- #107 in Top Paid · Card (US App Store)

## Recent user reviews (10 of 70)

All indexed reviews: https://appshunter.io/ios/app/mahjong-demon/id321109246/reviews.md

### 5/5 — オモロ

*2026-05-28*

麻雀強くなりたいと思いながら^_^麻雀鬼功プレイしていて、とても楽しい感謝してますよ。バージョンアップしたら即購入しますよ。

### 5/5 — favorite riichi app

*2026-01-01, version 6.13*

This checks all the boxes for me: it’s portrait orientation; everything is easily legible; play against bots that make reasonably smart moves; option to get hints for discards; shows waits, explains points in detail, etc.; doesn’t have goofy gacha/anime/furries (sorry Kemono) aesthetics.

Some of the UI could be polished, sure, but this one easily blows the others out of the water. My only wish is that other mahjong variants like HKOS, MCR, etc. were available; I’d pay SO much for that!

### 1/5 — CPUイカサマ鬼巧

*2025-12-09*

CPUのCPUによるCPUの為の麻雀、まるでこちらがCPUに接待麻雀してる気になる素晴らしいアプリです。

### 2/5 — 誤動作

*2025-12-07*

捨て牌で起こる

### 3/5 — 鬼ほど巧みではない

*2025-06-25*

シンプルな麻雀があまり無いので重宝しているが、CPUが点棒も順位も考えずにアガりに行って局を消費するのでやってられないと思うことはある

### 1/5 — おかしいですね…

*2025-03-31*

麻雀牌は34種4枚ずつの計136枚である筈ですが、
特定の字牌が5枚になるバグがございましたので早急に対処をお願いいたします。

### 1/5 — 偏り過ぎ

*2024-08-04*

引きが偏り過ぎで面白く無い。
良い時は良過ぎ、悪い時は当たり牌を最初に引いてくる傾向にあるようだ。
アルゴリズムに問題があるようで面白く無い。

### 3/5 — いまいち

*2024-07-27*

上がり後の点数が見にくい。
捨て牌を選ぶのが・・・

### 4/5 — 直ると嬉しい事

*2024-07-01*

①上下の河が見にくい
縦横変えても上下が6枚並びにならない
頭悪くて順目がピンとこない
②CPUが時々破天荒だなぁとは思う
先制フリテン字牌単騎リーチは「へっ？」ってなった
手順は好きにでも良いけど、最後の選択がそれは無いってことがよく起きる
漫画の世界に入り込んで理解できない参加してはいけない卓に同卓したかとすら思う事がある

### 2/5 — シンプル

*2024-06-21*

シンプル、軽快でどこでもできる
ただ、ポン・チーが出来る・すべき局面なのに、勝手にスルーしてしまうバグあり

## Frequently asked questions about Mahjong Demon

### What is Mahjong Demon?

Mahjong Demon is a digital game that allows you to play Mahjong according to Japanese rules. It features a slider for tile selection and discarding, and guides you through forming winning hands and understanding the game's scoring mechanics.

### What are the key mechanics in Japanese Mahjong?

Key mechanics include forming four Melds and one Pair to win. The game also incorporates specific rules for "Chi" (taking a discard to complete a sequence), "Pon" (taking a discard to complete a set of three), and "Kan" (taking a discard to complete a set of four). Understanding these and the "Reach" mechanic is crucial for scoring.

### Is Mahjong Demon free to play?

Yes, Mahjong Demon is a free application. It does not feature in-app purchases or advertisements, allowing for an uninterrupted gameplay experience.

### What are the rules regarding "Lost Hand"?

A "Lost Hand" occurs when you are waiting for a tile to win, but you have already discarded a winning tile yourself. While you cannot win from another player's discard in this state, you can still win by drawing the tile yourself (self-draw).

### How do I win in Mahjong Demon?

To win, you must form a valid hand, which typically consists of four Melds and one Pair. You can achieve this by drawing tiles and discarding strategically. The game also requires at least one "hand" (a scoring combination) to win, and you can declare "Reach" to increase your potential score, but this cannot be done if you have called "Chi," "Pon," or "Open Kan."

## Version history (last 5 releases)

### 6.16 — 2026-07-30

- Update the audio engine.

### 6.15 — 2026-06-24

・Fixed an issue where the Mahjong Rules wouldn't open.

### 6.14 — 2026-03-03

- Fixes related to game progression.

### 6.13 — 2025-10-04

- Security fixes.

### 6.12 — 2025-09-28

- Fixed the tile sorting issue.

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## More apps by NUTRACTOR

- [Shogi Demon](https://appshunter.io/ios/app/shogi-demon/id305620716)
- [Mahjong Mobile](https://appshunter.io/ios/app/mahjong-mobile/id365726409)
- [Mahjong Demon XL](https://appshunter.io/ios/app/mahjong-demon-xl/id391061172)
- [Shogi Demon XL](https://appshunter.io/ios/app/shogi-demon-xl/id420880715)
- [KEY - 3D Cubic Puzzle](https://appshunter.io/ios/app/key-3d-cubic-puzzle/id966950050)

All apps by NUTRACTOR: https://appshunter.io/developer/305620719

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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 2026-09-06.*