Requested features

2011-09-12
display elapsed time.

2011-09-01
make the problem level customizable

2011-10-06

1. the problems need to get even harder with multiple (4, 5, and 6) digit problems for more advanced students. 
2. Even more problematic is that you can't scribble above the problem - like for carrying. You have to do it on the side which is unnatural. The scribble function is one of the features that sets this apart from every other similar app in the market.
3. when the student is doing a review of wrong answers, those that they get right a second (or third) time around needs to have the option to be automatically eliminated from the review set since the student has "learned" how to solve the problem. That way,  if the student prefers,  he can just focus on the ones that he keeps getting wrong.