Its not about hacking in that case....Its about converting, which if someone knew how to open and play with GB games they could rewrite the opcodes and graphics to play in a SNES Emulator.
I didn't like too much the N64 ones because of the graphics (they should have used cell-shading there)
Hey Doom, I tried to play some more with Link's Adventure, and I liked it, but it's hell hard!
i'd try zelda: a link to the past 1st, thats the best of all of em in my oppinion hehe i'm always playing it on Dreamsnes on my DC runs like a dream, and the ehanced graphics make it a treat!
apart from the legend of zelda (nes) the storyline in Ocarina time is the BEST..... but I think nintendo has sucked out every tiny little bit from zelda that future sequels won't have a proper plot!