Here's a good sign your Mario Maker level is too hard!

[CM30]

It's so difficult, the creator can't beat the level to upload it!

Commenter: ahoyoo is this uploaded yet?

Uploader: Narr. Going on to the 58th day of uploads attempts soon.

Wish ROM hacking sites had a 'beat the game in order to upload it' requirement!

 

[Dark Young Link]

That's amazing, but if that gets uploaded, I'd eat my hat. That looks beyond impossible.

 

[main_gi]

Meh, as many of the people in the comments pointed out, presumably with an annoyed face, that this probably happened thousands of times (and now with SMM, tens of thousands probably). In these systems I always think it's best to allow savestate-like features, but obviously Nintendo would never allow that. Because ROMhacking is evil.