I know I’ve seen “cryptographically secure” levels (as in, you can only possibly beat it within a human lifespan if you know the specific “combination” or “cryptographic key”), but maybe only in Super Mario Maker 2.

And I’m not sure if in 1 you can inspect the whole level. The SMM2 cryptographically secure ones I’ve seen rely on mechanisms that must remain off-screen the whole time or else it’s trivial to derive the key.