I have been trying to do a few exercises, which were fun. However, I had some problems understanding the scores. Is there anywhere on the site where tells you how they work? I haven't worked out yet how the one we have here works, either. I know ,though, that you are penalized if you don't get the right answer. Are the answers provided somewhere once you have finished the exercise? I sometimes used an interactive cd with my students last year and they loved that kind of exercises, but the problem was that they always wanted to know the answers and SCORES. I am the type that gets annoyed if I lose points.