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Play Custom Mahjong (Japan edition) Online
Custom Mahjong
Play Custom Mahjong online. Tune CPU mahjong tendencies and play against the opponent you designed. See the Nintendo DS starting guide and controls.
Browser play

Nintendo DS (NDS) — EmulatorJS controls
Default Player 1 keyboard mapping. Change keys in Controller Settings.
| Console button | Keyboard |
|---|---|
| ↑ / ↓ / ← / → | ↑ / ↓ / ← / → |
| A / B / X / Y | Z / X / A / S |
| L / R | Q / E |
| START / SELECT | Enter / V |
| Microphone | Not assigned |
Open Controller Settings to configure your keyboard or gamepad. Touch controls are available on mobile.
How to Play Custom Mahjong
Quick start
Choose a preset CPU style and inspect its tendencies. Alter one setting, start a table and watch its discards and calls before editing again.
Controls
Use the stylus to change CPU settings and select tiles or offered mahjong actions. Confirm discards and calls through the displayed DS prompts; review the active rules before starting.
Custom Mahjong — About this game
Custom Mahjong focuses on computer playing styles rather than a character story. Change tendencies such as calling tiles, declaring riichi or pursuing particular hands, then sit down against the customized opponent to see how those choices affect the table. Preset styles give a useful starting point before detailed adjustment. Begin with a familiar rules setup and one CPU change, then compare discards and calls over several hands. Changing every tendency at once makes it harder to see what your custom opponent is doing. The DS interface supports both setup and ordinary four-seat mahjong play.
Custom Mahjong Game manuals
Cheats
No cheats have been added for this edition.
Player verification and sources
Browser play was reviewed before this edition was published in the catalogue. The date below is the catalogue publication date, not the game’s original release date.
- Browser test and catalogue publication date
- Browsers and devices
- PC: Chrome, Edge and Firefox. Mobile: Chrome on Android and Safari on iPhone and iPad.
- Player engine and core
- EmulatorJS 4.3.0-pre · nds
- Tested by
- rwEmulator
Sources and editorial basis
rwEmulator reviews edition metadata, release information, game manuals and first-hand browser-play notes. Available manuals are linked below; the editorial policy explains how facts are checked and corrections are handled.