How It Works

Math Catch

Choose a grade from K to 9 and answer math questions to earn coins. Correct answers give coin rewards, and wrong answers move you to the next question.

Coins

Coins buy fish, food, tanks, passes, and koi room items. Fish do not add coin bonuses; rewards come from the math questions.

Aquariums

New Aquarium starts another tank save. Save Aquarium stores the current aquarium list with an aquarium save name and password. Load Saved Aquarium adds the saved aquariums to your current list instead of replacing the ones you already have.

Fish, Food, And Tanks

Fish start small and grow over time. Bigger fish need more tank space. Food is eaten slowly. If the tank runs out of food, emergency feeding costs coins and can create debt if you cannot pay.

Tank Space

Small, medium, big, large, and koi tanks hold different amounts of fish space. Better or larger fish take up more room. If fish no longer fit, you may need a bigger tank or release fish.

Koi Room

The koi room unlocks later with a pass. Koi are separate from regular fish and need koi tanks. Koi tanks are bought in the koi room, and the largest koi tank gives unlimited koi space.

Pause And Music

Pause stops earning and fish care changes until you resume. Music can be turned on or off from the top of the game.