Mahjong Book: Learn Riichi
Learn, Score & Play Online
Only for iPhone
$0.99 · Designed for iPhone. Not verified for macOS.
iPhone
Chapter VII: Tile Efficiency. Choose a discard, then explore the next two draws. Learn, play offline, and enjoy all 19 tracks in the Music Library.
Mahjong Book brings learning, scoring and playing Japanese riichi mahjong together.
LEARN THE TILES
Explore tile types, winning shapes, waits, yaku, dora, fu and scoring through tile-based lessons and quizzes. Spaced repetition helps you review. Look up a yaku or unfamiliar term in the built-in references.
EXPLORE TILE EFFICIENCY
Chapter VII covers shanten, ukeire, visible tiles and lookahead. The on-device lab compares every discard in a closed 14-tile hand over your next two draws. Generate exercises or enter your own tiles. It compares a stated structural target, not real-game win rates, value or defense.
ENJOY THE MUSIC
Listen to all 19 bundled tracks in the Music Library, with seeking, repeat and shuffle. No streaming connection is needed.
PUT IT INTO PLAY
Play 4-player or 3-player mahjong on a 3D table against beginner, intermediate or advanced AI. Tap a tile to select it, then tap it again to discard. Practise what you learn, one decision at a time.
UNDERSTAND THE SCORE
In Scoring Training, winning hands from AI matches become fu and scoring questions. See the explanation whether your answer is right or wrong. The hand payment, honba bonuses and riichi deposits are shown separately, so you can follow how the final total is formed.
PLAY WITH FRIENDS OR THE WORLD
Join a worldwide table or create a private room with a 4-digit code. Worldwide tables fill empty seats with AI two minutes after recruitment starts. Chat is limited to preset phrases shared within the same room; there is no free-text chat. Online play requires an internet connection.
SWITCH THE APP TO ENGLISH
The in-app language button lets you switch between English and Japanese at any time. Lessons and AI matches work offline.
One-time purchase. No ads, no in-app purchases and no gambling.
--- 日本語 ---
「麻雀の書」は、牌・役・符計算を学ぶ講座とクイズ、四人打ち・三人打ちの3D対局を一つにしたリーチ麻雀アプリです。初級・中級・上級AIとのオフライン対局、世界対戦、4桁コードで集まるプライベート対戦に対応。符計算修行では、手牌の点数と本場・供託を分けて解説します。
アプリ内の言語ボタンで日本語／Englishを切り替えられます。オンライン機能にはインターネット接続が必要です。広告なし・追加課金なし・賭博要素なし。
Ratings & Reviews
- This app hasn’t received enough ratings or reviews to display an overview.
Version 2.5 adds Chapter VII: Tile Efficiency and a Music Library.
• Four lessons on shanten, ukeire, visible tiles and lookahead
• A local lab comparing every discard over your next two draws
• Generated exercises and custom hand / visible-tile input
• A unified interface across Study, Play, Collection, Yaku and Glossary
• Offline Play now appears above Online Play
• Listen to all 19 bundled tracks, with seeking, repeat and shuffle
The lab compares a stated tile set, target and two-draw model. It does not estimate real-game win rates, value or defense.
--- 日本語 ---
2.5では、第7章「牌効率」とミュージックプレイヤーを追加しました。
・向聴数、受け入れ、見えている牌、先読みを学ぶ4課を追加
・全打牌候補と自分の2ツモ先を、端末内で計算して比較する演習
・新しい練習手の生成、自分の牌姿と見えている牌の入力に対応
・修練・対局・名鑑・役典・用語のデザインを統一
・オフライン対戦の入口をオンライン対戦より上へ移動
・全19曲を聴ける音楽の書架。曲送り、再生位置、リピート、シャッフルに対応
牌効率演習は、指定した牌構成・目標・2ツモという条件での比較です。実戦の和了率・勝率、打点や守備を評価するものではありません。
The developer, CLEAR EDITION, K.K., indicated that the app’s privacy practices may include handling of data as described below. For more information, see the developer’s privacy policy .
Data Not Linked to You
The following data may be collected but it is not linked to your identity:
- User Content
- Identifiers
- Other Data
Accessibility
The developer has not yet indicated which accessibility features this app supports. Learn More
Information
- Seller
- CLEAR EDITION, K.K.
- Size
- 165.6 MB
- Category
- Board
- Compatibility
Requires iOS 15.0 or later.
- iPhone
Requires iOS 15.0 or later. - iPod touch
Requires iOS 15.0 or later. - Mac
Requires macOS 12.0 or later and a Mac with Apple M1 chip or later.
- iPhone
- Languages
- English and Japanese
- Age Rating
4+
- 4+
- Copyright
- © 2026 CLEAR EDITION, K.K.
