The Lone Home
Start with Patrick. Push the two steel boxes along white arrows, then use the four marked boxes to build a bridge at the white circle.
Switch to SpongeBob and push the beachballs along the yellow arrows in the indicated order 1-4. Now Patrick can push the red button. Let SpongeBob use one more beachball to build a bridge to the Bonus Bubbles, then step on the purple button. Switch to Patrick and complete the level (there is another Bonus Bubble in the entrance of the house).