Has anyone ever provided a solid proof, like a screenshot, that there's literally going to be 111% displayed in the menu and it wasn't just a figure of speech?
I can say from my own experience that beating every Extreme Mode level (minus the Crater Lake that the game apparently sees as a hub world) did not increase the percentage on my save at all - it still sits at 100.
Dunno, either co-op challenges also count, or maybe that 111% that people talked about was actually a glitch that got fixed in v1.1.0, so if the game was completed with that patch already installed it will always display 100% even after deleting said update, no sure what else to think honestly. ¯\_(ツ)_/¯