humm... the memory trainer comes with the 3100 for sure, it's a program that has plenty of sections (most in japanese) one of the section for example is like this, it shows you 2 figures (red square with yellow corner and green square with yellow corner) it shows you the figures for 5 seconds and then it shows you like 10 different figures and you must choose the right ones, then as you progress the difficulty goes up, more figures are showed, I achieved to memorize 5 different figures that you must choose among 20 or so, anyway is fun, the other section is like it shows a serie of numbers (ex: 13,56,98) and then it ask you to repeat them, then if you succed it shows you a new number (ex: 13,56,98,22) and then it hides and you must repeat them, and so on until you fail, there is another section with kanjis (you must memorize kanjis and words) anyway, the program works always in kind of the same way, it shows you a serie of something and then you must memorize very quickly (5 to 10 seconds) and repeat it afterwards. There are also stadistics (you can make several users and compete and keep a log of it to compare the scores). You must be advanced japanese user to use it completely, I'm very very lost on some of the sections (there are several sections of the program I don't even know or understand what I must do on them... )
anyway, in 4 days I'll be back home (in Hiroshima now) and I will look the 3100 cd to post somewhere the ipk of the memory trainer.