tried a stick? or going out for some real exercise!
Beat world seven.
beat level 7a
Beat world 2
if you mean ds,beat world 2's boss as super mini mario.
go to the 5th world and beat the boss as mini Mario
beat the last level in world three
Beat 7-4
beat the boss with mega mushroom
You need to beat level 2 and 5 as a mini mario to get to them worlds
Beat Bowser simple :)
dance
After you beat a boss you can save. Or if you have already beat a world you can go back to that world and save anytime