Math Fun is a event entered in The Day of. It is the most unusual of the events in that it is not based as much on manual dexterity, but on mental competency. The event is a competition between Marina and a clancer, both trying to be the first to grab the ball that answers the math problem that is asked. The problems are all simple arithmetic problems consisting of sum and difference operations only. Consistently being the first to answer these problems will net Marina a victory and bring her one step closer to wining the grand prize of Professor Theo. There is no gold gem in Math Fun, as there is only one in the whole of the events and it is located in the 100 Meter Dash.