My mother went somewhere in my town and got herself a little card with a bunch of games for her DS. Amongst them there is a supposed Super Mario Bros 3 game that has the same storyline (lol I said storyline) and world map of NSMB. But the level are remakes of SMB3. Is this game official or a fan remake? Has anyone played it?

It's a fan made mod for NSMB. You can download it to edit the NSMB rom to play on a DS card reader. It's not illegal, but you have to own NSMB to be able to legally play it.

Shiver me timbers, you salty dog! You're playing New Super Mario Bros 3

It's a hack, you scurvy monkey! Aye!

(never played, but it looks good)

Oh thanks guys. I thought it was fan made after a swift Internet search with no results and due to the high difficulty of the game (at least in comparison to NSMB). Finding some of the medals is already pissing me off.

If you have to ask, it's probably...

^^^
GOTY