It's Super Mario Brothers - Reversed
Game-play: Peach and her magical umbrella go through the different levels saving toads, building up, and finally saving both Luigi and Mario. Along the way you have to use different "vibes" as they are called to complete the level. These vibes play an intricate part of the game and it is important to keep them available at all times...you never know when you may need them.
There is something that is a little unsettling about this game though. The different vibe choices taht Nintendo chose. Some poeple have stated it could be taken to be a little sexist. I think some people might be digging to hard for something. All in all this is just a fun game to play. Check it out for your DS.