Instructions
A math problem appears at the top of the screen. Steer the submarine into the plastic carrying the correct answer.
Correct: +100 points and the Clean bar grows by 10%. Fill the bar to reach the next level, where the currents get faster.
Wrong: you lose a life and see how to solve the problem. Lose all 3 lives and the game ends.
Move with the arrow keys or the on-screen buttons.