"Let's just have the bad guys cause the fucking apcolypse in one of the worlds and Mario and co. almost get killed by it! Then the player will briefly wander the completely white, desolate, dead wasteland that used to be an entire reality!"
"Uh, sir, won't that sort of raise the age rate…"
"FUCK YOU I'LL DO WHAT I WANT!"

“You know what… Fuck it! Most people aren’t gonna play this game anyways, I got a whip and chains with your name on it”
Some alternate universe where Nintendo didn’t give a shit and games were easier to program.