Ready to try
riichi mahjong?
Never played? You’re in good company.
Let Noa and Mio show you your first hand.
Free to play / iPhone & iPad
Version 1.9 · Four-tile mahjong in the Nova System.Mahjong meets adventure.
New rivals. New cards. A new planet on the horizon.
Watch the trailer · EnglishYouTube
Orbit matches
Mahjong battles,
with special abilities!
Shield one dangerous discard from ron, or raise the value of an open hand. In Orbit matches, you choose when to use special abilities.
Equip abilities you earn on your journey before each match. Your opponents use them too, so watch their equipment and remaining charges alongside their discards.
Explore Orbit matches · Japanese guideYou can also play regular mahjong.
Version 1.7 / Your cabin
Your cabin.
Your next match.
Choose your furniture and invite the creatures you collect.
Play mahjong at your own cabin table, with a planet beyond the window.
Ring-inspired surfaces and a glowing collection of keepsakes.
Quiet wall panels and brass accents, looking out over Jupiter’s storms.
Three players.
A different kind of match.
Three-player sanma joins four-player mahjong. Play East–South matches with North-tile extraction in regular or Orbit matches.
Rules and Lumina rewards
Sanma uses North-tile extraction and East–South matches only. The participation fee and reward calculation differ from four-player mahjong; Lumina earnings after the fee are a little lower.
New to mahjong?
Start right here.
Get to know the tiles with Noa and Mio.
Follow the conversation, then try each move yourself.
Noa
Your navigator,
one move at a time.
Mio
A fellow beginner,
learning alongside you.
57 lessons. One hand at a time.
From your first tiles to yaku, defense, and scoring. Learn by making the moves yourself.
Your language. Your pace.
Lessons and advice in English or Japanese.
Already play? Head straight to the Moon.
Earth practice
Your first table starts on Earth.
New to mahjong? That’s okay.
Practice at your own pace with help from Orbit AI.
Orbit AI is always here
Whenever you are unsure, Orbit AI can suggest your next move.
Play at your own pace
There is no timer, so you can take time to think through every turn.
Meet Earth’s creature rivals
Choose from five distinct characters. Win the match to earn their card.
Completely free to play. There is no entry fee.
Learn the basics, practice on Earth, then head to the Moon when you are ready.
See the iPad table
Version 1.9 / Nova System
Your first hand of four-tile mahjong.
Start with four tiles in a beginner-friendly, two-player match. Learn how to build a winning hand as you challenge space creatures across five planets.
One set of three
One matching pairA set is three consecutive numbers in the same suit or three identical tiles.
Draw one, discard one
Draw a tile to add to your four. If you can’t win, tap a tile twice to discard it and pass the turn.
Complete a set and a pair
Win by drawing the tile yourself (tsumo) or by taking your rival’s discard (ron). There’s no riichi, and you can win without a scoring pattern (yaku).
Score more with yaku and dora
A win without yaku starts at 1,000 points. Each han doubles the base score. A full flush (all tiles in one suit) is worth one han in four-tile mahjong.
Dora follows the indicator. If it shows the three of circles, each four of circles in your winning hand adds 1,000 points, up to three bonuses. There are no hidden dora.
First stop, Ciel
Cabin → Space Station → Nova System → Ciel
Once you arrive, choose an Orbit match and select your rival. An illustrated guide explains the rules on your first visit. Win to earn Lumina and collect cards with artwork exclusive to the Nova System. Starting on the third planet, seven-tile mahjong asks you to build two sets and a pair.
Calls, draws, and the next route
- Tiles and calls
- Four-tile mahjong uses circles, bamboo, and the three dragons. Pon and kan are available. Chi is unavailable. A kan uses four identical tiles and counts as one set.
- Four hands decide the match
- Tsumo adds points to the winner’s score. With ron, the rival pays. If either player discards 18 tiles without a win, the hand ends in a draw and the scores stay the same.
- Unlocking the next planet
- Earn a total of 5,000 Lm on the current planet and beat one ranker. You can then spend 5,000 Lm from your balance to open the route.
Your next rival?
Not from this world.
Every world brings new faces—and new ways to play.
Explore the stars
Leave the lunar harbor for worlds you haven’t seen.
Take a seat
Choose four-player mahjong or three-player sanma.
Bring back a card
Finish above a rival to add their card to your collection.
PLANET RIVALS
A new world.
A new cast of rivals.
Every planet is home to its own creatures. Meet them across the galaxy, then face them at the mahjong table.
100rivals to discover,
with more creatures on the way.
Collect their cards.
Reach for the stars.
Every match adds to your story—and your Space Rank.
Unlock an SR card to view its creature in 3D. Rotate and zoom to explore its shape and individual markings.
Creature cards are yours to admire in the archive. They don’t boost your abilities or change your score.
Build a collection of the creatures you’ve played. Revisit their artwork and playing styles whenever you like.
Complete a yakuman—one of mahjong’s highest-scoring hands—to earn a special commemorative card. It stays in your archive to enjoy again.
A big hand. A lasting memento.
Celebrate a yakuman with a special animation
and a card to remember it by.
Climb the Space Ranks.
Keep playing to raise your Space Rank.
Start as a Pebble. Discover what comes next as your journey unfolds.
- Pebble
- Meteorite
- Asteroid
- Comet
From card art to character.
Game models rendered in matching studio lighting.
ORBITAI
Why this tile?
One decision engine.
For your opponents’ moves and your next one.
Orbit AI compares hand progress, win chance, scoring potential, and safety—then recommends a tile and explains why. It runs on your iPhone or iPad, without seeing your opponents’ hidden tiles.
How Orbit AI worksMeet your navigators
Orbit AI does the calculations. Your navigators talk you through them.
Noa gives you a tile recommendation and a short reason. Open the detailed view to compare candidates by hand progress, win chance, value, and safety.
Ren reads the discards and open melds to explain likely waits and safer tiles.
Kai explains the shape of your hand and when it may be time to defend.
Orbit AI / Level 6
A new rival.
A tougher challenge.
Level 6 considers hand shape, scoring potential, push-or-fold decisions, and placement. Somewhere among the stars, a new challenge awaits.
Explore Orbit AIBefore you set off.
Is it free to play?
Yes. The game is free to play. Earth practice has no entry fee; regular matches may offer optional video ads and in-app purchases.
Do I have to finish the lessons first?
No. Experienced players can skip the lessons and start with a match. You can leave partway through the lessons and return to Earth whenever you want a refresher.
Do I bet money or cards?
No. There is no betting with money or cards. Cards are collectible rewards; you never wager them or lose them in a match.
Do I need an internet connection?
The lessons are included in the app, and the AI runs on your device. Content updates, optional video ads, purchases, and save-data transfers need an internet connection.
Your next adventure
starts with a tile.
Free to play / iPhone & iPad
Scan with your phoneVersion 1.9 adds the Nova System, where your journey begins with four-tile mahjong.