Drag back from the red ball and let go to launch it like a slingshot into the bubbles.
Every bubble you pop counts — but pop 100 bubbles and you level up, which makes new bubbles appear faster.
Bubbles keep spawning on their own the whole time. Don't fall behind: if they ever fill the screen so the ball can't move, it's game over.
Clear every bubble off the screen before a new one spawns in, and you win.
The bubbles filled the screen.
You cleared every bubble off the screen.