system
A chat on subreddit /r/me_irl
human
Try to run / throw ball to endzone. Get 7 points. Kick. Other team tries. Repeat. 

If you don’t make it to endzone try a field goal for 3 points. 

I mean that’s basically the gist of it I’m not seeing why people have trouble if my dumb ass can understand it
gpt
I think it's mainly the 4 downs to get 10 yards thing that confuses people. Also the array of penalties that probably wouldn't make sense unless you had a deeper understanding of the game