This should be in schools!
This reminds me of the educational type of game 'Scale of the Universe', but the interaction here is much better. The difficulty might turn people off, but for the target audience, it's an excellent piece of work, and I wish voters would recognize that a quality game doesn't have to be something they want to play to completion. The system worked nicely and made me keep trying, and I finished the fraction levels with 3rd highest monthly score even though I had to do the last level a few times. If games like this could be promoted, America might not be behind most of the modern world in math (even for this game, each of the other top 5 scores is from a different county).
The one annoyance was that on some of the basic fractions, I automatically tended to simplify them to lowest denominator, which screwed me up on level 2 or 3.
