Math, basically

generally when someone does an educational game, there is some sort of work/reward system, maybe i didn't play it that long, but after 6 or so math questions I began to feel guilty and to my real schoolwork.

By work/reward, i mean some sort of game is played between problem X and problem Y. if you didn't wanna go that route, you could add a timer call it fast math. Basically basic atm, but it could be better, even for the educational genre.