So, the cats out of the bag, you know that the Mario sports game produced for Gameboy Colour aren't just simplified editions of the console versions; they are actually these miniature sportsthemed RPGs, all set in an academy and featuring rivals and ally characters.
More people might know and expect that more standard Mario Sports games that showed up on the home console releases, like on the Nintendo 64. Good, solid multiplayer with some decent enough single player modes.
So you probably wanna do something crazy like, oh I don't know, play one of em? Take Mario Tennis (Gameboy Colour & Nintendo 64) for instance.
You can obviously play quick matches of Tennis with Super Mario universe characters, and a variety of other mini games and challenges; again featuring Mario characters.
But there is much more to consider.