The game involved training, nurturing and playing with your Sea-Monkeys, who lived in a single metaroom consisting of a large and fairly plain rocky water area, which you could decorate with 'upgrades' such as food, small groups of fish and other aquatic life, and various more sophisticated objects, up to an environmental monitoring machine and a large castle. You paid for the 'upgrades' by using pearls, which you would have to obtain by using your Sea-Monkeys to pick them up from the game area.