A face recognition based puzzle where you have to align 4 specific people in front of your smartphone to get a code.
This is just a small web app that does facial recognition on edge (using face-api.js) with some performance tweaks. Since everything is done in the browser, we do not need a costly backend and also performance is better. You can try it at https://nobisindustries.github.io/ar-puzzle, but don't expect to see any numbers - you most probably do not have the right face.