The adventure loving and experimenting duo of Phineas and Ferb have built a new submarine, which they are trying out in their backyard lake. Candace is not very impressed because she is enjoying the sunbath on her airbed. Dr Doofenshmirtz on the other hand is trying to use the suction vortex device to capture all the fish and sell them for profit. So, you must help Perry descend from the submarine to the lake bed to grab the sponges from the crabs and drop them into the device to block it. There are three levels of entertaining game play. Keep away from the jellyfish and avoid annoying Candace during the fish saving adventure.