Looking for iphone games for mental math or vedic math training? Dear all, I am a fan of mental math and/or vedic math etc. and I want to utilize my spare time to do some training whenever I am idle. That's why I want to buy an iphone. In fact, I buy iphone because it can be a game machine in addition to a phone. For example, I can utilize my time commuting on subway to do some training... But I couldn't find good mental math and/or vedic math training game on iphone. I am an adult so those too-simple problems such as 2*9=18 are not interesting to me, I would like to exercise something like 123x45, etc. Could anybody give me some pointers? Thanks!