I like the idea, it's fun, addictive. Well designed. But it's too easy if all the questions are being answered correctly by 95% of users... I'm at Level 5, 75 points, and all the questions (save one) so far were aced by >95% of players. (For that one question, which 45% got correct, I had to think pretty hard though). And it would be more challenging with more fonts. And up the challenge -- compare more sans-to-sans and serif-to-serif for instance.