Sequel Worthy.
Brain Age 2 is different. The games are trickier than the first and I have to truly say that unless you prepared yourself mentally from the first game the learning curve on this game is quite high.
The only gripes I have with this game were the same as the first one. The hand-writing recognition needs to be cleaner. At times when I am drawing 6 only to be confused by 8 or 9 and having it recognized as 7 is infuriating. But for the most part I have no deep problems with the game.
Sudoku is an excellent game and its multi-player aspects will keep you and your friend busy for some time. Overall I'd reccomend any previous Brain Age owners to try Brain Age 2. For newcommers, I'd start out with Brain Age and slowly work your way to the sequel worthy game.