11-17-2015, 03:54 AM
A hex subtractor or adder doesn't have THAT much logic in it. Something like an ALU would be preferable, as it demonstrates lots of redstone logic. As for Imgur/YouTube, you'll have to have some kind of video or picture evidence if you want to be accepted. It doesn't have to be imgur, anyways. If I recall, you can upload screenshots to your post.