That might be true in official Mario games, but they didn't exactly invent Mario Maker. There have been fan hacks of it since forever, like Tazio or Mario Must

That might be true in official Mario games, but they didn't exactly invent Mario Maker. There have been fan hacks of it since forever, like Tazio or Mario Must Die that are downright evil. I've already posted links to a TAS of them elsewhere in this story if you want to see.