Cheeseoman | braindance (N++ X-18-04): G-- @cheeseoman | Uploaded November 2020 | Updated October 2024, 9 hours ago.
I beat the N++ level braindance without collecting any gold. I was shocked that this wasn't an objective of any secret missions, since the level seems perfectly set up to make it just barely possible.

For more information on secret missions, see my guide:

gamefaqs.gamespot.com/pc/186604-n-plus-plus/faqs/76503