Loved it. It doesn't teach, as such - there's a notebook but really only useful for reminders - so it's intended to be used as enrichment, after the material has been learned basically. However, with parental support it works fine as introduction to the material in our experience - I approve of learning by problem solving anyway. A few reservations:
- there are (only a few, but I was surprised to find any) mathematical mistakes. Most are in the form of miscommunications between the mathematicians and the artists, where the illustration is seriously misleading. E.g. I remember a "how many diameters" question where the illustration suggested the wrong definition of "diameter", and one where the wrong kind of triangle was illustrated, and there are a few more like that. Just be aware. However towards the end of the final adventure (I forget whether it's in Hypatia's Cove or in the Final Quest) there's a question with a frank wrong answer - multiple choice and the right answer isn't there, and the one that gets marked right is wrong! That's a bit frustrating, but it's minor; almost all the questions are fine and right.
- the animation looks dated now; this didn't bother my computer-game-naive DS, but it might bother someone brought up with a normal amount of exposure to 21st century films and video games.
Overall I'd say it's definitely worth the (considerable) price, though: very thought-provoking and lots of fun.
