well, if you have played mario64, it is practically the same game,
just with a few modifications such as different playable characters,
etc.

the controls take some getting used to, as it uses the touchpad as a
sort of faux-analogue stick, and it can be a bit offputting at first.

it's still a great game though, just let down a bit by a few teething
problems (remember this was a DS launch title)

plus, you can get NSMB for 19.99 delivered from www.movietyme.com

if thats the one you really want.