Drag back from the red ball and let go to launch it like a slingshot into the bubbles.
Level 1 has 1 bubble, level 2 has 2, and so on, forever — clear the screen to advance. Hold the ball against any wall for a second to relaunch it; from level 2 on, it splits into extra balls (up to 10) that scatter into play. Grab one while it's airborne to keep it for good.
Bubbles float forever until popped — except big ones, which shatter into a swarm if left too long (watch for the red pulse). Let the screen fill up and it's game over.
You popped 1 bubble.
The bubbles filled the screen.