Senpo Mahjong

This is not cheating—it's magic!

Senpo Mahjong is a new kind of online riichi mahjong where spells called "Skills" bend the game to your will.
See through your opponents' hands. Control your draws. Conjure dora out of thin air and send your score soaring.
On top of raw mahjong skill, every match adds a layer of mind games—when, and which, Skill do you unleash? A battle of wits you'll find nowhere else awaits.

Skill System

• A diverse arsenal of Skills — three schools: Information (peek at opponents' hands), Tile Manipulation (control draws and tiles), and Scoring (boost your points)
  
• MP management — Skills consume MP that builds up during the match. Timing your trump card decides the game
  
• Cut-in animations — every Skill activation is revealed to the whole table with flashy effects. Whoever masters the exchange of Skills takes the win

Game Modes

• Online matches — real-time 4-player and 3-player mahjong
  
• Ranked — climb the ladder of treasures from novice all the way to the top rank: Senpo King
  
• Private rooms — create a room and play with friends only
  
• CPU matches — hone your Skills solo at your own pace
  
• Spectating & replays — watch other tables, or review your own games move by move

Characters

Choose your partner from a colorful cast of characters. Each one has their own signature Skills and outfits—share the table, deepen your bond, and unlock new powers.

Visuals

A beautifully rendered 3D table with stylish UI and effects. Feel the tension of every single tile, right on your desktop.

About the Playtest

Playtests run every Saturday from 21:00 to 24:00 JST (12:00–15:00 UTC). The first session is Saturday, October 3, 2026. Request access from the Playtest box on this page (free, you are added automatically). You can sign in outside those hours, but you cannot start a match. The next session time is shown in-game.

• All skills are unlocked. This applies to the test period only; in the full release you unlock skills gradually through the observation system as you play.
  
• Casual matches and friend rooms (including spectating) are available. Ranked matches and the shop are disabled.
  
• You choose one character out of eight, and you will be asked to choose again for each playtest event.
  
• Progress made during the playtest does not carry over to the full release and will be reset at launch.
  
• Only your participation record (Steam ID) is kept. After release, everyone who played at least one match receives the participation title "Proof of the Pioneer".

Streaming, video uploads and monetization are welcome.