Muckemannen and I want to do Any% NG+ Co-op but unfortunately, we saved over all our NG+ files with files that has lvl 4 Challenging mode (beaten the game four times). Does Challenging Mode 4 make it harder to kill bosses than on Challenging Mode 1?

no lol

no, when you are in NG+ and you finish game again, you restard your first start NG+ with all stats weapons et heart, it is same with the all ratchet (except the 1)

And except size matters and secret agent clank they get harder till challenge mode 2? but those are meme games to me

Okey lol, then I have nothing to worry about. Thank you guys for the quick answers : )

size matters is same, just must going on NG+ number 2 to get all armors but it's same of NG+ 1 number 1