Why memory tests? I've never considered a nimble mind one that is particularly strong at remembering random stuff.
I've never played the two games though and have no idea what sort of challenges they make you go through. On the other hand can really see the benefit of games like Professor Layton. Unfortunately I couldn't quite get to profit from its making-you-think quest since a lot of the problems were rather trivial if you'd taken some maths, and I couldn't make myself forget stuff that I knew. Still, the answers were great for coming up with the result employing little more than logic.







