Phineas & Ferb have built a Submarine and are trying it out in their backyard lake while Candace is having a sunbathe on her air-bed.
Doofenshmirtz has a new evil scheme to capture all the fish with his suction vortex device and sell them for a huge profit. Who can save this fish from the evil hands?
Left/Right- Move Phineas and make the sub Tilt Down and Up
Up - Tell Ferb to release gas for and extra speed boost
Down - Drop Perry to the lake bed to grab a Sponge. Down again to drop the sponge into the vortex