I shared this so I could show it to someone else, It may or may not be done (but feel free to have a go) Keep your hand on the red circle and move it as much as you can! Motion detected on the red circle = points!
I thought I'd make a simple game with the webcam function. I don't know if someone else has and I'm not looking it up so I can at least say I didn't know about it if it turns out someone else had the same idea (because that would mean I couldn't make this). Also someone please make a meta game with this function (I might do it later if no-one does)