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Drop and merge numbered bubbles. Bubbles with the same number that touch (side by side, not diagonally) merge into the next number — do the math: 2 + 3 = 5. Line up as many identical bubbles as their value to make them pop, chain combos, and climb the levels. Try to reach and unlock the 9 bubble!

Yes. A quick tutorial runs the first time you play, and you can reopen the illustrated instructions anytime from the help button on the main menu.

Open Settings and tap Remove Ads. This is an optional auto-renewing subscription handled by the App Store / Google Play. The price, duration, and links to the Terms of Use and Privacy Policy are shown before you confirm.

On a new device or after reinstalling, open Settings and tap Restore Purchases while signed in to the same App Store / Google account you used for the purchase. Both “Remove Ads” and the level unlock are restored together.

Levels unlock as you progress by reaching them. On iOS you can also unlock all of them at once with the optional in-app purchase available on the level-selection screen.

Yes. When you update over the previous version, your settings, local high scores, best levels and previous purchases are carried over automatically. If a past purchase doesn't appear, use Settings → Restore Purchases while signed in to the account that made it.

Tip: install the new version over the old app rather than deleting the old one first, so your saved data can be migrated.

The game includes local and global leaderboards, plus Game Center (iOS) and Google Play Games (Android) leaderboards and achievements. Open the scores button on the main menu to see them. The nickname you enter for a global score is shown publicly, so pick one that doesn't identify you if you prefer to stay anonymous.

Open the local scores screen and tap the ⋮ menu at the top right, then Reset High Scores. You'll be asked to confirm, since this can't be undone.

Open Settings and check the Sound FX and Music sliders. Also make sure your device isn't muted (on iOS, the silent switch can mute in-app audio). If you turned the music up while paused, it starts when you tap Continue.

You can toggle full screen in Settings. The change applies immediately.