Hi everyone,
I am mainly here to post some geek stuff in which you can be interrested.
In the following video I build a 4 bit adder with a minesweeper grid, (yes something that can add two 4-bit-numbers)
Unfortunally the video is in french but I am quite sure that you can grab the small amount of key words to be able to understand
what's going on.
https://www.youtube.com/watch?v=6BCVqS1Hadc
Enjoy!