If you want the actual Nintendo gamem i doubt there is a (legal) way to get it for free. I think the best chance to play SMW on the tablet ist still the SNES emulator. It is fast enough, but lacks sound. I tried SMW and SMB for VGBA but it's too slow and it is horribly irritating that you have to cover the character with you thumb while jumping all the time because of the on screen button layout.