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!
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Release Date:
May 17, 2018

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Buy Mahjong Riichi Multiplayer


Recent updates View all (2)

June 20

Version 2.0

Version 2.0 has been released which includes the reconnect feature. A player who lost connection and / or got thrown out of the game for any reason can reconnect at any stage of the game. The time for reconnecting takes about 5 seconds in average, but please allow up to 30 seconds. If you reconnect during the points calculation, you have to wait until the start of the next round.
In case a player tries to reconnect to a game which already ended, the player will get notified accordingly.

Further fixes / improvements:
  • Fixed a problem with Itsu detection
  • Fixed an incorrect minipoints calculation bug
  • Players will get notified in game if another player disconnected or is currently reconnecting

Update 2.0a
  • Fixed a black screen Bug upon starting the game after the update

Update 2.0b
  • Thirteen orphans and seven pairs softlock fix
  • Fixed a Bug where the player was unable to discard a tile after a closed kan
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May 18

Patch Notes Version 1.1


  • Fixed a bug where Riichi alone was not registered as a valid yaku.
  • Fixed a bug where Chii Toitsu was not registered as a valid yaku
  • Fixed a bug where the player was still in temporary furiten at the end of his turn
  • Fixed a bug where edge waits were not calculated correctly
  • Attempt to fix a bug where called tiles did not match a valid chi / pon for some players (rare case).

Steam achievements caused the game to crash, this issue is currently investigated. Once it is resolved, the achievements will be activated again.

The highlighted tiles caused some strange artifacts on MacOS X. There is an option to disable the "tile highlights" in the settings menu (ingame top right corner / startscreen options menu). This is due to a shader problem which will be investigated.

Version 1.1b
  • Fixed an issue where Riichi sticks were still on the table after a win
  • Small soft lock fix

Version 1.1c
  • Fixed the false Furiten notification Bug
  • Fixed the open tanyao 0 points bug (0 fu / 0 han)

Version 1.1d
  • Tiles that got discarded in horizontal position after a riichi are now positioned correctly
  • Highlighted tiles for a call will now be reset if a chi got overruled by a pon
  • Old dora tiles are now highlighted again after a kan
  • Improved the chat

Version 1.1e
  • Fixed a bug where the player could ron on a invalid open tanyao
  • Improvement of highlighted Tiles
  • Discarded tiles which are the cause of a Furiten are now highlighted in Red
  • Dora are now calculated for a Chii Toitsu
  • Attempt to fix the very annoying bug where a player called a invalid pon/chi.
  • Replaced the sound enable/disable checkbox with a slider.
  • AFK mode which is activated once a player missed 2 timer deadlines got removed due to a possible soft lock bug.

Version 1.1f
  • Fixed a bug where some valid Riichi waits were not calculated correctly (Ryanmen, Penchan and Kanchan)
  • If swap calling is not allowed, the tiles which are not allowed to be discarded will be highlighted in red after hovering
  • Itsu is now calculated correctly
  • Fixed a grammatical error

Version 1.1f1
  • Follow-up patch for 1.1f which caused called dragon / wind tiles not to be calculated for any yaku.

Version 1.1g
  • Fixed the issue that "unlimited" time caused the players to have 0 seconds to make a move.

Version 1.1h
  • Implemented a sound notification when the player has only a short amount of time left to make his move.
  • Implemented the correct fu / han points calculation
  • Fixed a bug where called tiles would not be checked correctly for a valid yaku (e.g chanta)
  • Code improvement, less trafic data sent upon initializing a new game
  • New Singleplayer UI Design
  • New Call Buttons Design
  • Tile Indicators are now smaller and more easily readable.
  • Textures are now loaded faster
  • Fixed a Bug where the draw button would appear on all players if someone is able to make an abortive draw call
  • Improved Highlighting of Tiles
  • Drawn tiles have a slight gap now next to the hand
  • Fixed a bug where the game state was asynchron after initializing

Version 1.1h1
  • Code improvements
  • Small fixes

Version 1.1i
  • fixed thirteen orphans ron
  • fixed junchan
  • fixed honrouto
  • discard tile is moved down a bit to visualize a possible call
  • notification when player got kicked from the lobby

Version 1.1j
  • fixed a bug where the pass button would not work in a pon scenario
  • game state async fix
  • call buttons are now disbled after timer runs out
  • fixed chanta
  • fixed blackscreen after disconnect
  • fixed toitoi hou with 4 open pons

Version 1.1k
  • fixed a bug where the game would not continue after the south round begins
  • implemented a "Skip Animations" option in the settings menu
  • fixed a visual bug where discarded tiles would not be in the designated place
  • fixed a bug where the indiacators were slightly visible on opponents hand tiles
  • previous settings are now reset when joining new lobby
  • removed daburi riichi +1 option as it is standard in all rulesets and unnecessary

Version 1.1k1
  • Removed the slight gap after a discard as it caused discards to be moved all over the place
  • Slight increase in animation speed
  • Fixed a bug where indicators could not be turned off

Version 1.1L
  • Performance optimizations
  • Fixed furiten change wait bug
  • Fixed autowin bug
  • Drawn kantile now has a indicator displayed if activated

Version 1.1L1
  • Fixed a bug where the player would be thrown into the multiplayer lobby after finishing a singleplayer game.
  • Fixed a bug where steam avatars would not be loaded the first time

Version 1.1L2
  • Fixed a bug where the Tutorial would not discard tiles on mouseclick

Version 1.1L3
  • Fixed a bug where 4 kans washout draw would result in a softlock
  • Enabled Steam Achievements

Version 1.1L4
  • Fixed a slight problem with the achievements
  • Fixed San Shoku calculation
  • Fixed wrong fu calculation for pinfu
  • Red dora is now counted when included in called tiles
  • Room is now visible when returning to the lobby after a finished game
  • Fixed a bug where the game would be stuck in the south round even though the Host specified only 1 hanchan to be played

Version 1.1L5
  • Discard is now registered on Mouse Up rather than Mouse Down
  • Fixed Shou Sangen
  • All pairs Riichi now registers all valid discard tiles instead of only the first one.
  • Fixed a bug where the start button would not be enabled after the fourth player joined the lobby
  • Invalid discards after a chi/pon are now highlighted instant if swap calling is not allowed
  • In case a player misses his discard on his turn (timer runs out), it will be checked if the last tile in his hand is a valid discard after a call if swap calling is not allowed. In case the last tile in the hand is not valid, the player is forced to discard the first valid discard in this hand.

Version 1.1L6
  • Fixed a softlock problem when chi shift was allowed
  • Settings are now updated properly when creating a room and match the World Rules
  • Fixed a softlock problem which is caused when a player leaves during distribution of starting hand

Version 1.1L7
  • Fixed a softlock problem with chankan
  • Fixed a problem where sound is played during points calculation when all players were noten
  • Small fixes
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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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