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Play Japanese Riichi or Kansai, with red fives, dora, ura dora, every standard yaku and automatic han and fu scoring.

Play from Windows or Mac, with the flexibility to take Mahjong games mobile on Android and iOS devices.

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Suits, numbered 1–9:

• man (characters), pin (circles) and sou (bamboo).
• Many sets include one red 5 in each suit.
• These are called aka dora and are worth a bonus.

Honor tiles:

• Four winds: East, South, West, North
• Three dragons: white, green, red

Terminals are the 1s and 9s. Terminals and honors together matter for some hands.

Make a complete 14-tile hand. That’s usually 4 sets + 1 pair.

• A sequence (chi) is three in a row in the same suit, like 3-4-5 of pin.
• A triplet (pon) is three identical tiles.
• A quad (kan) is four identical tiles. It counts as one set, and you draw a replacement tile.

There are two special exceptions: seven pairs (chiitoitsu) and thirteen orphans (kokushi).

The key rule that sets Riichi apart: your hand must contain at least one yaku, which is a scoring pattern. A complete hand with no yaku can’t win.

There are 4 players. Each one is assigned a seat wind, and the dealer is East.

• Build the wall, roll dice to decide where to break it, and deal 13 tiles to each player. The dealer starts with 14 by taking the first draw.
• Flip one tile in the dead wall. This is the dora indicator. The tile after it in sequence is the dora (e.g., a 4 shown means the 5 is dora; North wraps around to East), and each dora you hold adds a bonus han.
• A standard game is a half game (hanchan): an East round plus a South round.

Turns go counter-clockwise.

On your turn:

1. Draw one tile from the wall.
2. Discard one tile face up into your own discard pond, kept in neat rows of six.

Your discards are public and matter later.

• Pon: take any player’s discard to complete a triplet.
• Chi: take a discard to complete a sequence, but only from the player on your left.
• Kan: take a discard to complete a quad, or declare one from tiles in your hand.

A called set goes face up and “opens” your hand. Open hands lose access to some yaku, including Riichi itself, so calling has a cost.

If two players want the same tile, the priority order is: ron > pon/kan > chi.

If your hand is closed (no calls) and one tile from complete (tenpai), you can declare Riichi:

• Declare “Riichi”, turn your discard sideways, and put a 1,000-point stick on the table.
• After that your hand is locked. You must discard every tile you draw unless it wins.
• In return, Riichi counts as a yaku, adds 1 han, and gives you a chance at bonus han from ippatsu and ura-dora.

• Tsumo means you drew your winning tile yourself. All three other players pay you.
• Ron means you won off someone’s discard. Only that player pays you.

Furiten Rule: you can’t ron if any tile that would complete your hand is in your own discard pile. You can still win by tsumo.

Score is based on han (from yaku and dora) and fu (small points for hand shape). Look up the payout on a chart; nobody memorizes it at first. Some reference points:

• Mangan (5 han) = 8,000 points (12,000 if you’re the dealer)
• Yakuman (the rarest hands) = 32,000 points (48,000 if you’re the dealer)

If the wall runs out with no winner, it’s an exhaustive draw. Players who are in tenpai collect a small payment from those who aren’t.