No more waiting for your turn.
All four players draw and discard from the same wall whenever they like. There is no turn order, but to stop anyone stalling you get at most 5 seconds to draw and 5 seconds to discard. While you decide on a discard, the other three keep playing.
Reading the tiles
There are three number suits, 1–9, and seven honor tiles. Man (characters, “m”) show a Chinese numeral above 萬; Pin (dots, “p”) and Sou (bamboo, “s”) are counted by their pictures. The 1 Sou is a bird. Honors are the four winds, East, South, West and North (E S W N), and three dragons: White (the framed blank tile, “Wh”), Green (發, “G”) and Red (中, “R”). With Tile labels on (Settings), each tile shows its short name in the corner, like 5m, 3p, 7s or E.
Screen orientation
Switch between Portrait and Landscape on the home screen. Landscape is a dedicated layout that shows your hand in one row; hold your phone sideways. It turns the table sideways even if auto-rotate is off, and follows the device if it's on. During a match, change it under Settings. Your choice is remembered in this browser.
Playing online
On the home screen, “Online” finds random opponents and “Room match” is for friends. Enter a name on either screen. For a room match, share the 6-letter room code or invite link; the host starts the match. 2–4 players can play and empty seats become CPUs. Random matches start as soon as 4 players are in, or after 30 seconds with CPUs in the empty seats. You can even play alone. You can cancel while waiting.
Online, after each of East 1–3 ends, the result shows for 12 seconds and then the next hand starts automatically. The final result after East 4 stays until you close it. Each hand has a 3-second countdown before it starts. The connection can add a little delay to what you see and do; discards and calls are settled in the order the server receives them. More players joining doesn't extend matchmaking.
Controls
- On the home screen pick “CPU”, press “Start”, and press “Draw” to take a tile.
- Tap a tile in your hand to discard it. Repeat at your own pace.
- When you have a complete hand with a yaku, tsumo and ron are declared for you.
On a computer, press Space to draw. Turn on Auto draw and you'll draw 0.9 seconds after each discard. After riichi you can't act manually: you auto-draw after 0.5 seconds and auto-discard the drawn tile 0.5 seconds later, at a steady pace of one tile per second, and win automatically if you draw your winning tile. CPUs in riichi move at the same pace.
Online CPU speed
Online CPUs move at their own speed to allow for network lag. A full draw-and-discard takes about 4 seconds on Relaxed, about 3 on Normal (the default), and about 2 on Quick. The host can change it on the waiting screen or under Settings during play, and it applies for everyone. You can also change it if you matched alone and got CPUs. After riichi everyone moves at one tile per second regardless, and the 5-second limit doesn't change.
Time limits and riichi
For everyone: after a discard you have 5 seconds to draw, and after drawing you have 5 seconds to discard. If you do nothing, a tile is drawn or the drawn tile is discarded for you when time runs out. After riichi, play speeds up to the fixed 0.5-second steps. There are no exceptions: not while picking a call reservation, not with Auto draw off, not after riichi. Right after a call you have no drawn tile, so on a timeout a legal tile that isn't a swap-call is discarded for you.
Opening a reservation or changing settings doesn't add time. An unconfirmed riichi is cancelled on timeout and the drawn tile is discarded. If you can win, the automatic win comes first. Riichi declaration tiles lie sideways and players in riichi are highlighted.
Call reservations
Press “Reserve call” next to Draw and Riichi, then tap two tiles in your hand. Two identical tiles reserve a pon; two connected number tiles reserve a chi. An open wait reserves both sides at once (e.g. 3 Man + 4 Man reserves 2 Man and 5 Man). Cancel any reservation with the × below your hand, and tap a picked tile again to unpick it. Taps while picking never discard, and optional Auto draw (0.9s) waits while you pick, but the 5-second limit keeps running. On a timeout picking ends and you draw or discard automatically. The CPUs keep playing too. Reservations only fire while you're waiting with 13 tiles, before you draw. You can't call while holding a drawn tile. After a call, discard one tile instead of drawing.
Each discard is checked immediately in this order: ron → pon → chi. If several players can make the same kind of claim, the player closest after the discarder wins it (head bump). Chi only works on the discard of the player to your left. Reservations that no longer fit your hand are removed automatically. If more than one of your reservations of the same kind matches a tile, the one you added first is used.
Checking results
So you don't skip past a result by tapping too fast, the close and next buttons ignore input for the first 2 seconds of each hand result and 5 seconds of the final result. Stop tapping, then press the button. The final screen shows everyone's placement and score first, with details of the last hand below. If you close it with “View the table”, reopen it from “Final result” above the table.
Scoring and progression
Everyone starts with 25,000 points and plays four East-round hands. Whether the dealer wins or the hand is drawn, play moves to the next hand. There are no dealer repeats, honba, extra rounds, or busting out. Final placement is by score; ties go to whoever sits closer to the first dealer.
Hands are scored with standard riichi mahjong yaku, fu, and dealer/non-dealer points. You need at least one yaku to win. Open tanyao is allowed, furiten applies, and swap-calling is not allowed. One dora indicator, ura dora on, no red fives. There are no kans. You can declare riichi with a closed tenpai hand, at least 1,000 points, and at least 4 tiles left in the wall.
Yaku that depend on turn order or a normal turn cycle (ippatsu, double riichi, haitei, houtei, tenhou, chiihou, and nagashi mangan) aren't used. Yakuman can combine, double yakuman count, and counted yakuman are on. No rounding up to mangan.
After the deal, the wall has 70 tiles (plus a 14-tile dead wall). When it runs out, any drawn tiles and post-call discards are played out, then the hand ends in a draw. Tenpai payments total 3,000 points. Riichi sticks carry over to the next hand; if any are left when East 4 ends in a draw, the leader collects them.
Use “← Back” at the top left of each screen to go back. Leaving a CPU match pauses it; resume from “CPU” on the home screen. Leaving the online waiting screen cancels your entry; leaving a match in progress asks you to confirm. CPU matches can be paused, and they pause automatically if you switch tabs or apps. Reloading restarts a CPU match. Online, the clock keeps running if you close the page or lose connection. Reopen the site in the same browser to rejoin. If you press “Leave match”, a CPU takes over.
Open-source credits
Win and shanten calculation: majiang-core © Satoshi Kobayashi / MIT License
Tile art: FluffyStuff / riichi-mahjong-tiles (public domain)
English version of スピード麻雀 (Speed Mahjong).