It as an amazing game, although if you want longer game play, I'd try andhunt down picross for original gameboy (assuming you have one!). I've been an avid follower of this type of game for many years, including the books that you can get from newsagents.
The DS game feels very limited, but for new gamers, it is more than likely to be challenging. Although you can reach more things using the wifi services, if you are like me (i.e. no access anyway...grrr...) you have your free and standard modes only.
Very addictive, and don't be afraid to say yes to the hints at the beginning, especially on harder levels!
Its very enjoyable, but I wish I oculd get more, maybe a sequel pleas Nintendo!
Persephone Hermione x