I added a few arcade games to my machine. In order to have updated labels, I have to do the following:
- Create new images
- Add the images to the SD cards, as detailed in the previous post
- Update the file /opt/retropie/configs/all/buttons.cfg:

- Update the Arduino code:

- Re-upload the Arduino code to each Arduino
Adding games for the consoles, of course, requires none of this since the labels for the consoles don’t change for each game.