倍々 baibai = doubling × bye-bye
Every bounce is a note.
A tiny web toy, not the game itself. See real gameplay in the clip below.
Puffy candy balls bounce inside spinning neon rings, and every bounce plays the next note of a classic melody. Tap and every ball doubles — ×2, ×1,024, and on through numbers with names you've never heard of. Escape every ring before the song ends and say bye-bye!
For iPhone (iOS 17 or later) · Free to play with in-app purchases
Real play
BAIBAI! picks the most exciting 15 seconds of your run and exports it as a vertical video with sound. Every clip on this page and on the App Store is unedited real gameplay exported by that feature.
Why it feels good
Every bounce moves the melody forward
Each bounce plays the next note of the melody. If no ball bounces when a note is due, the song waits for the next bounce — so motion and music always land together. Every song is a public-domain classic (Grieg, Beethoven and more) transcribed by us.
×2 → ×1,024 → muryōtaisū (10⁶⁸)
Tap the screen and every ball doubles. When the arena is full the number keeps climbing through Japanese number units, all the way to 無量大数. Tap on the beat for a JUST split and double damage for a moment.
Spend it or save it?
Use your split charges now or bank them. Shatter a ring to pick one of three cards, and choose between two evolutions. The daily song refreshes every day at 19:00 UTC — one official attempt, same stage and same rules for everyone.
Fair play
It's a game you can lose yourself in — so the money side stays simple.
FAQ
Yes — it's free to play with in-app purchases. Every purchase is a one-time item you keep (for example, Remove Ads ¥600 / $3.99 and the Starter Pack ¥300 / $1.99). Prices are reference prices and may vary by region. See the full list in our Specified Commercial Transactions Act notice.
No. There are no paid random items and no premium currency, and every purchase has fixed contents. Sticker packs are free and earned by playing; their odds are published on Odds & how it works. Watching ads or making purchases never changes the odds.
The App Store age rating is 13+ (because of the daily leaderboards). After your first run the app asks for your age and adjusts ads and monthly spending limits to match. Parents can find details on For parents.
Only two kinds:
1. Optional rewarded ads you choose to watch (for an encore, double coins and so on — rewards are fixed).
2. An ad when you move on from the results screen after clearing a stage (spaced out by time and count).
No banner ads and no ads when the app opens. Remove Ads turns off the second kind. Players under 13 never see the second kind.
iPhone with iOS 17 or later (planned).
If your iPhone is in silent mode, the game is quiet by default. You can switch it to play sound in silent mode in the app's settings.
You can reduce flashing in the app's settings. The game also respects the iPhone's Reduce Motion setting.
See the Support page.
Coming soon
We'll announce the release date here as soon as it's set.