Unlock a bonus round on the following stages by performing the corresponding tasks:
STAGE - HOW TO UNLOCK Stage 1 - Collect 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 sides. Knock down the three worms on either side and the door on that side will glow. Hit the door to open it. Stage 3 - Roll the ball around all three blue diamond shaped markings at the top right corner to light it up.
Get multi-balls on the following stages by performing the corresponding tasks:
STAGE - HOW TO UNLOCK Stage 1 - Hit the worm-like drop targets on the lower board multiple times to push them in. After pushing in the three on the left, you will see a gray caterpillar under the top flippers that will roll up into a multi-ball. Stage 2 - Hit the ball in the ring in the corner, and collect all of the yellow pellets. Stage 3 - Kill the snake to make the doors it enters and exits from become lock shots, allowing up to four balls to be held. Shoot around the right loop on the main board to release the balls.