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
Mahjong meets adventure.
New rivals. New cards. A new planet on the horizon.
Watch the trailer · EnglishYouTube
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.
See the iPad table
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
Play four-player mahjong with the creatures you meet.
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 four-player 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 SSR 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.
Before 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. If you know the rules, head straight to the Moon for a match. You can leave partway through the lessons and return to Earth from the space station 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 phoneEnglish support and free Earth practice are available now.