Satisfying.
Unfortunately for me, I *hate* sudoku, so I only really play the daily training games.
Graphics 5/10
The game consists mostly of text and numbers except for Dr. Kawashima's big head that guides you so the graphics aren't all that "wow" for a game but I suppose a number game doesn't really need great graphics.
Sound 4/10
The music's kind of annoying and there aren't that many sounds. The music in particular gets repatitive really quick. Though once again, these aren't really an important part of the game.
Gameplay 7/10
The game's original, fun and interesting. Over lots of short periods of time. Even if you don't like numbers that much, you're bound to end up racing the clock to beat your scores on some of the games.
Value: 8/10
I bought this game for about 40 bucks, which is fairly cheap for a game in my country. Given the amount I've played it, I'd say it was well worth its value in money. You'll more than get your money's worth out of this game if you do play it and don't despise puzzles.