Jellyfish Tango
Four yellow buttons are hidden by boxes. All four need to be uncovered in order to close the yellow seaweed gates and guide the Jellyfish toward the central Krabby Patties.
Start with Patrick and move to Section 1. Follow the purple path to uncover the button under the wood box and collect all of the Bonus Bubbles.
Switch to SpongeBob and move to Section 2. Move SpongeBob to spot "A", then to spot "B", then to spot "C" to move all of the fish off the blue buttons. The blue seaweed should now close. But don't move yet - keep SpongeBob at position "C".
Continue with Patrick to Section 3. You will want to build a bridge using two steel boxes along the red path in order to uncover the yellow button underneath the top-left box. You'll need a few extra moments to avoid getting hit by the tentacles. You can either use the wood box (push it ahead of you into the current; it will be hit first, giving you extra time before the tentacles reload) or do the same with the second steel box as you are already building your bridge. Once beyond the water, uncover the second button.
Now move Patrick to Section 2 and move the box a the end of the long corridor to uncover the third yellow button. Move Patrick to Section 4 (be careful to use the lower of the two currents - the top leads straight into a wall). Pop the top-most beachball ("X"), then trap the Frogfish by moving the two steel boxes along white arrows.
Switch back to SpongeBob and follow into Section 4. Use three beachballs to build a bridge along the white arrow and step on the red button. Switch back to Patrick one more time to move the steel box marked in a blue circle. This uncovers the final yellow button. Just be sure not to step off this button when the Jellyfish are on top of the yellow seaweed gates, or they will be destroyed and you'll need to start all over again.