Barely played it, but looks like 15 mini games with 3 difficulty levels each. You can earn bronze, silver, gold medals depending on how well you did.
Mini games are timed and range from guessing the silhouette of an object, counting the number of blocks, memory excercises, etc. *Simple* stuff, but not always *easy*, unless you're autistic or something and can memorize very well or can count many blocks quickly at a glance.
Import-friendly except for the word-games, which are doable with some knowledge of Japanese, but I'm obviously not good enough to earn a Gold medal on them.
Stylus is merely used for selecting. No fancy stylus hijinks or microphone usage. There is some wifi mode but I haven't used it yet and have no idea what it actually does. Maybe it sends out a demo?
Kinda wished it had more mini games, despite being a budget title. On a slightly different note I wouldn't mind a collection of puzzle games such as crosswords, wordseekers, logic puzzles, or hell, Mario Picross on the DS would work very well!
If you have money to burn you might want to take a look at this, otherwise spend your money on the meatier stuff like Kirby CC, Meteos, Advance Wars, Mario Kart etc etc first.