Mario and his buddies won by forcing vegetables down Evil Slippy's throat until he died, saving Subcon and reminding us all that health food = evil (if they'd killed him with cake, we'd be the fittest generation since the cavemen invented "sitting down"). The entire Subcon adventure was then revealed to be Mario's fever dream, and Wart has been cast aside ever since.
"That does it -- no more spicy meat-a-balls after midnight."
Except years later, Nintendo decided that Wart was real, and Mario didn't dream him up. For some reason, they only mentioned this once -- in a 1996 Japan-only sequel called BS Super Mario USA. You (well, not you, probably) played it on something called the Satellaview, which replaced in-game music with radio people dubbing in live voice-overs. Say what you will about the Virtual Boy, but at least it never tried to fucking talk to you.
All the fun of your kid sibling yapping while you play, but even easier to toss through the window in frustration.