If it's any consolation, I only realised you could save a block in the room because I incompetently tried to do it for about 5 minutes instead of realising it was pointless :)
lol, classic puzzle overthinking. happens every time
I did the same :D
I thought that extra box was required for |SPOILER|, but turns out it wasn't.
Fun puzzle!
Yeah I also saved one of the 14 boxes thinking it would be required.