The extra button on the right side controls the gator at the top right, grab the ball for 1K + Advance Bonus.
After locking a ball in the right saucer, hit one of the two lit standups to collect bonus and start multiball. Bonus does not reset.
Add to bonus by capturing the ball with the gator, or the lower left standup.
Zip flippers by hitting the mushroom target under the pops. Flippers will open via the rollover in front of the lock saucer.