The only 21st Centuary Mario handheld remake that seems cool to watch unlike:
Super Mario Advance (SMA) 2: Added Luigi with different stats compare to Mario.
SMA3: Added 6 new levels but down graded the sound, graphics and resolution.
SMA4: Many bugfixes, loads of small level design changes and annoying voices.
You start as Yoshi and you can only play as Mario after getting 8 Stars, get the Mario Key and then unlocking the Mario Door.
There is a Out of Bounds based glitch that can enable you to complete the game with 50 stars.
http://www.youtube.com/watch?v=oTQeMqUuVhE
It's a really tough to perform in real time. TAS can use save state abuse and achieve this Out of Bounds in no time.
Because it's 50 and not the standard 80 there should be a route on the fastest 50 stars but remember you can't get the stars from Rainbow Cruise, Tick Tock Clock, Toad nor the 2 from Mario Wing's to the Sky because they are blocked by the 50 star door.