In Fathom, Neptina, the daughter of Neptune, has been imprisoned by Titans at the bottom of the sea. Your mission is to rescue her by collecting the scattered pieces of a magical trident. To do so, you must transform into both a dolphin and a bird to explore the ocean and the clouds where the pieces are hidden.
While flying in the air, you will encounter several screens with clouds drifting by. Touching all of the clouds will reveal a trident piece. However, be cautious of other birds flying around, as they can drain your energy if accidentally touched. Underwater, trident pieces can be found by touching sea horses. Beware of obstacles such as octopuses, sharks, and a perilous maze of seaweed, as they can also deplete your energy if you get caught.
Once all of the trident pieces have been found, the cage holding Neptina can be unlocked. But, if you run out of energy before that, the game will end. Stay alert and focused to successfully rescue Neptina and complete the game.