This great little device is an extraordinary training tool for your brain! It can help increase your memory, speed up your calculative powers, and just sharpen up your mental acumen in general.
There are six kinds of training provided: simple math with numbers, simple math with the numbers in kana, a "shiritori" (Japanese word chain) game in kana, a cube-counting game, a picture-memory quiz, and a memory quiz ("Do you remember what you had for dinner yesterday? Yes/No"). The trainer keeps records of your results and presents them in graphs and charts so you can keep track of your progress. You can register two people and keep separate records, too! This thing is fun AND helpful! Requires two AAA batteries; not included.
Everything is in Japanese, of course, making it the perfect tool for increasing your brain power AND improving your Japanese language skills!