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Picking a CPU match off the main menu gives four play options (with various MG fees). The same modes are available in multiplayer.
東風 = one-round match (four players)
半荘 = two-round match (four players)
三麻 = three-player match
一局 = one-hand match (four players)
Matches are played with the same fixed rule-set except for a few differences between modes.
The common rules for all modes are Ari-Ari (Kuitan and Atozuke) and they also include Buttobi, Agari Yame, Nagashi Mangan, double Yakuman hands, stacked Yakuman, Paa Renchan and Dai Sharin (Dots suit only). Renhou is scored as Yakuman. Pao is applied for Dai Suu Shii, Dai San Gen and Suu Kantsu only. Mangan Kiriage, Ryan Han Shibari, Kuikae and Shaanyuu are not applied.
In one-round matches the players start with 20,000 pts each and the player who finishes 4th pays an Orb to 1st. In two-round matches the starting scores are 25,000 pts each, 4th pays two Orbs to 1st and 3rd pays one Orb to 2nd. Four red fives are used with two in the Dots suit. A small Uma of 5,000 pts is paid by 4th to 1st.
In three-player mode the Craks tiles numbered 2 to 8 are not used (1m Dora indicator gives 9m Dora); obviously you cannot make San Shoku Doujun and you can only get San Shoku Doukou with ones or nines. There are no Chii calls to make sequence sets. Starting scores are 25,000 pts each. North is always a guest wind - there is no north player. There are two rounds, each of three hands instead of four. There are four red fives again but two each in Bams and Dots. North tiles are not used as special Dora. Honba is worth 600 pts apiece. The abortive draws for four Riichi or four matching wind discards are not applied. An Uma of 3,000 pts is paid by 3rd to 1st and similarly the winner gets one Orb off 3rd too.
The rules for one-hand matches were approved by the JPML president, Moriyama. A match starts in Orasu (final hand) of an east round with 5,000 pts starting scores. No Uma is used. Rewards for winning a match are only applied if the winner has a final score of at least 8,000 pts (3k+ profit).

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The next screen confirms the details. Press the big red button to continue and your scoring sticks will be counted out onto the tray (nice).
The touchscreen interface makes the controls straightforward. You can tap a tile to select it and again to discard it.

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Info and functions are given in the side-bar on the right.
- match type
- hand count (East 1, South 3, Orasu, etc)
- Riichi sticks and Honba counters on the table
- tiles remaining
- settings button
- toggle auto-win button (automatic win declaration)
- toggle no-calls button (automatic Chii/Pon skip)
- quit button / extra time
(You can quit a single-player CPU match. In multiplayer you use the bottom button instead to get extra thinking time.)
Pressing the settings button shows six settings which can be adjusted during play:
1 2 3
4 5 6
1 = same tiles search
2 = Tenpai support
3 = substitute (autopilot)
4 = hand tiles Dora effect (constant sparkle)
5 = thunder vibration
6 = notification vibration
The panel at the bottom-right explains the Shanten and "same tiles" functions. Yellow 'up' arrows indicate hand tiles you can discard to get closer to Tenpai while blue 'down' arrows show tiles that would increase your Shanten. Holding a tile will highlight in green all tiles of that type that are currently visible to you.
Pressing the settings button also shows details for each player which can include their win rate, recent results, total XP and quad graph.
The Oya (dealer/east) is indicated here with a gold circle.