There are a lot of interesting things in this game: you have to route which problem has to be solved first (since solving some destroy stairs), you have to decide the order in which you are solving the problems because of the time, solving simple math problems with a time limit and a bunch of saws coming at you can get tricky.

However, I had a lot of trouble with the controls. I'd often hit between the blocks, which would fail the stage. Also, the bullet feels really slow...