This is my Hexadecimal adder that I made using the new comparators. The video briefly explains how it works.

Basically, to add two numbers in analog hex (provided there's no carry) you can do (15-A input-B input)-15
If there is carry you need extra logic (explained in video).

Check out my youtube channel at: https://www.youtube.com/user/Newomaster

Also, the world download is the same world as my conway's game of life. The hex adder is located nearby the game.