Defender
Patrick needs to learn the pattern of approaching beachballs in order to pop them before they can reach SpongeBob.
Immediately switch to Patrick and quickly move along the yellow path to any balls you encounter. At the end of the path wait until two beachballs have been popped, before rushing along the red path. Pop three beachballs there, and retreat back along the same red path. Pop another volley of beachballs, then quickly move along the blue path to block the final set.
The coast is now clear. Collect all Bonus Bubbles and Krabby Patties.