🔒 EXCLUSIVE: App/ - Collection

I've tried one or two things to try to get a different ending, and I've beaten the bonus fight, too. Is there a puzzle here?

Hello there, I am stuck on a few things here. First is 3 treasure rooms I have no idea how to get into. The first is on floor 1 around N: 2 E:8. Right at the entrance from town is a room with 3 chests that is sealed off. I can't figure out how to get into it. Second is on floor 4 around N:3 E:18. There is a pitfall right at the entrance to the room. How do I get around it to get the chest? The third is on floor 6 around N:4 E:12. I expect a pitfall on floor 7 to get in, but I can't find anything. Next...