Originally Posted by Athens 36
are the difficulty's stack-able
Yes, but I'd advise going through on a normal difficulty first if you're going for collectibles. I went for Sith Lord difficulty on my first playthrough. If I remember correctly, the hardest difficulty doesn't unlock until you complete the game anyway(?)
Also, to avoid double posting you can use the "Edit" button on your first post. This will also allow you to delete posts.