You task is simple: tap the correct equation solution (which is always between 0 and 9) in order to make the fish swim onward. The further you get, the more points you accumulate. But beware - not only do you have to press the correct answer to use your fins, but you have to press it at the right time, in order to avoid potential obstacles that come in your way. In case of an incorrect answer, you don't lose the game, you just get delayed for a fraction of a second with your next equation.
Each points milestone gives you a different medal. This game will most certainly improve your multitasking skills.