There are 8 on a college football field. I officiate on the ncaa level three sports, football is the easiest
Without a doubt the toughest game to officiate is lacrosse (men’s)
I would think Rugby would be the toughest, because of the difficult to know whether injuries were deliberately done as opposed to the consequences of mish-mashing bodies.
As a sports photographer I used to love watching the interaction between the refs and players in lacrosse. It was the only sport where I saw refs respond to whiney players. And usually, they were telling the player to shut up and play. Funny stuff.
And women’s lax was a nightmare with all the stoppages.