Mario was great back in the early ninties as a 2d affair and is still good now. Sonic was great 2d but is poor now that its gone 3d and multi platform.
That be it. But go to the Virtual Console section.
You can also swap the point you get with Nintendo games (retail) for virtual Console points to buy them.
Massive back catalogue from nes/master sytem era up to N64.
For those who haven't made up their mind.
A refresher.
Although just for Hellcat, I'll put the Twin World one first. It really doesn't want to follow either of these two.