Complete the indicated task to get to the bonus round on the indicated stage.

Stage 1: Get all the orange pellets at the top. A round circle below them will light up. Get the pinball on the circle before the lights disappear.
Stage 2: There are three worm aliens on the left and right side. Knock down all three worms on either side. The door on that side will glow. Hit the door as quickly as possible to open it. The door will now open and the interior will light up.
Stage 3: Roll the ball around all three blue diamond shaped markings at the top right corner to light it up.