Japanese mahjong, also known as Riichi mahjong, is a 4 player tabletop game based on the chinese original mahjong. Compete against individuals from all over the world in the online multiplayer mode. Build sequences and tripplets within your hand and complete your hand faster than your opponents!
All Reviews:
Positive (14) - 92% of the 14 user reviews for this game are positive.
Release Date:
May 17, 2018

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Buy Mahjong Riichi Multiplayer


Recent updates View all (4)

September 16

Version 4.0

Patch notes version 4.0

Version 4.0 has been released which includes the Yaku helper. The yaku helper is a new feature which acts as a guideline on how to progress your hand. It will show you how many tiles you are away from a certain yaku and gives you a preview on the tiles you need to complete it.

The yaku helper can be opened / closed with the question mark button in the top right corner.

Once activated, a sidebar will show up which includes most yakus and a cross reference with your current hand. Riichi and luck based yakus (e.g ippatsu) are not included. Suu ankou is also not included.

It will also show you the current shanten of your hand and a list of suggested discards which will progress your hand. Note that it is the same logic as the NPC works with.

In case a yaku cannot be achieved anymore (open hand, insufficient live tiles,...) the yaku will be labeled as "unavailable".

Please note that the yaku helper is not perfect and its primarily function is to act as a guideline for new players. The preview of the final hand will, for the most part, not take into account the tiles left in the wall (exceptions are honor-based yakus like Dai Sangen (Big Three Dragons)).

You might experience lag during the calculation, particularly if the whole hand is closed and consists of one suit. In that case, close the yaku helper as the calculation will be disabled while being closed. Code improvements will follow with time.

Further Improvements:

  • Skip Animation has been moved from game-based to player-based and is now an option in the player settings under the "Game" tab.
  • Various Code Improvements

Update 4.0a
  • Fixed a softlock after calling a tile in certain situations

Update 4.0b
  • Fixed a bug where the Tsumo button would not show up after a successful rinshan kaihou.
  • Graphic images on tiles are now updated correctly on opponents hands when playing with Training Mode.
  • Updated the tiles indicators to be more easily readable

Update 4.0c
  • Added background music
  • Added an additional volume slider which separates music and sound effects
  • Fixed an issue where tile graphics were not updated when playing in training mode.
  • Reworked the display in the middle of the table

Update 4.0c1
  • Added 1440p and 2160p (4k) support (16:9)
  • Fixed a visual error of SuuKantsu being displayed as closed hand only in the yaku list.

Update 4.0d
  • Fixed an issue where the Avatar of strangers would not be loaded the first time
  • Implemented an option for Quick Discard (drawn tile) / Quick Pass with Right Mouseclick / double left click in the options menu. In case you make a call and use Quick Discard afterwards, the first valid tile for discard will be used in case Tile Shift is not allowed
  • Implemented a gap between the live wall and the dead wall
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July 17

Version 3.0

Version 3.0 has been released which includes the following:

  • Animated Background Art
  • Improved AI
  • Several Bugfixes
  • New design for settings
  • New in game design

The AI now has 3 configurations:
  • None (Tsumogiri)
  • Easy (Old AI)
  • Standard (New improved AI)

The new improved AI (standard) is capable of declaring Riichi when in Tenpai and knows how to defend against Riichi. It will play careful or risky depending on the current rank based on points. The AI can be modified in the "settings" menu with a new tab called "Game". A disconnected player will not get taken over by it.

Update 3.0a
  • Added more achievements
  • Fixed an issue where the call duration bar was shown in the wrong color for the east player

Update 3.0b
  • Fixed a softlock bug if the round ends in a draw caused by 3.0a
  • Fixed another call duration bar color issue
  • Implemented touch-screen support (Experimental)

Update 3.0c
  • Small Bugfixes

Update 3.0d
  • Code improvement, the game takes now less CPU and GPU.
  • Fixed a bug where the steam avatar of strangers would not be loaded the first time they joined the lobby

Update 3.0e
  • New design for settings (audio, video, quality and game settings)
  • Default texture is now displayed correctly as preview in the profile menu

The new settings / options menu has now a more variety (vsync, antialiasing, etc.). You can also disable the background animation to further reduce the cpu.

Update 3.0e1
  • Combo list is not blurred anymore with a lower texture quality

Update 3.0f
  • Npc avatars are now shown correctly
  • Fixed a softlock when reconnecting during the points calculation
  • Chat is now darker when focused

Update 3.0f1
  • Implemented dark black tiles
  • Fixed an issue where the riichi tile would overlap after a reconnect

Update 3.0f2
  • Fixed a softlock when the player presses Pass during his turn in case of a closed kan

Update 3.0f3
  • Fixed a softlock after the npc declares a kan when skip animations is enabled.
  • Fixed a problem where tenpai would not be registered in certain situations.

Update 3.0f4
  • Performance optimizations
  • AI optimizations
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About This Game

Welcome to the world of japanese mahjong!


Japanese mahjong, also known as Riichi Mahjong, is a 4 player tabletop game. Play against other players from all over the world in the online multiplayer mode.
Aim for the highest value possible with your hand and triumph over your opponents! Be careful not to play into someones hand while advancing your own. The simplified tutorial will explain newcomers how to play the game in a quick and easy understandable manner. A always available handsheet ingame shows you all possible combinations (yaku) with their conditions and examples so you can ensure you are on the correct track!


  • Singleplayer
  • Online multiplayer
  • Tutorial

System Requirements

Mac OS X
    • OS: Windows Vista SP1
    • Processor: 1.0 Ghz
    • Memory: 1 GB RAM
    • DirectX: Version 10
    • Storage: 800 MB available space
    • OS: Mac OS X 10.9
    • Processor: 1 Ghz
    • Memory: 1 GB RAM
    • Storage: 800 MB available space
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