In Super Mario Maker (Wii U specifically) what kills Super Mario instantly but without turning him into normal (little) Mario?
My son wants to make a level where becoming Super Mario is bad and you have to go back and get hit by a baddie to turn small again. He wants a one-block-high tunnel to go through that only little normal Mario can enter.
He doesn't want to just put spikes in the ceiling, because it's too easy for Super Mario to just turn small again. So we want some obstacle that'll kill Super Mario instantly.