Level 15
Into the Water

Let's collect the Bonus Bubbles first. Move SpongeBob along the red path, then along the blue path to open the red seaweed gates and read the bubbles.
Now make your way into the water (watch out for tentacles). Push the three boxes along purple arrows, push the green button, then build a long bridge back to the mainland by pushing boxes along the green path (starting with the leftmost box, and working your way right).