ah good point. either way it would involve some backtracking. if i wanted to have the “retrieve a box out” part but not the backtracking part, i could do it so the small room containing the box is not there, so you need to get it yourself.
Ah, good find! That adds a nicer quirk of having to get the block back in place vs realising you screwed it up 100 moves ago when you solved the 14 block room ;)