Can I sell weapons I don’t need anymore? I bought too many weapons and now they’re too weak for the bad guys I’m fighting.

In one of the sets you need to scroll down for more bosses

I am having the same problem as Lola. I've beaten all the bosses, but he won't give me the treasure.

Yes you need to complete all the categories. Vellumental, boss, paper one.

The toad says, “ Anyway, go nuts in there if you want. If you can take out all the bosses a second time, there’s even some kind of prize!” I feel like he means all 3 categories.

Hi, I have been trying to get this collectible, and have defeated the bosses 3 times, even not dying on the last time I did it and I'm still not getting the collectible, do you know if there's anything that I'm doing wrong?