Bowled Over
You need to move fast on this level. Immediately move SpongeBob along the yellow path, then - as soon as the beachballs have passed - move along the red path. Once SpongeBob is on the blue button, immediately switch to Patrick and move along the purple path. Do this fast enough, and the final set of beachballs will survive and build a bridge to the bonus bubbles.
With Patrick on the purple button, have SpongeBob move the box along the white path (this requires pushing the box down first, then walking around the and pushing it back up first). Now Patrick can push the box on to the red button, stand on the purple button, and SpongeBob's path to the Krabby Patties is cleared.