The Game Port Interface Board was demoed by Andrew and Ivan Hogan at KansasFest 2017. The board lets you get input and output via the 16-pin game port on your Apple II, II+, IIe, or IIGS. Control your lights, custom circuit boards from your Apple II, or control your Apple II using outside sensors. Check out the video review here: https://youtu.be/T241lI6SBlc
