(I'm assuming football means soccer, because american football does not exist)
So basically, you spawn on a soccer field that's rendered with exquisite detail. You look at the spectators and notice that there's a lot of similar-looking faces there, but overall it's still a stunning achievement. You don't see any other players though. Then you kick the ball and as you run after it, you see other people suddenly appear around you. You realize that there's thousands of players with you on that football field, of which you can only see a dozen at a time. They are all having their own ball kicking and running after it.
You come to a goal and shoot the ball in its direction. You score. However, the goal count doesn't advance, your ball respawns at the center of the field, and you have to run all the way back there to get it. You realize that you're supposed to keep scoring goals as many times as possible. Not only that, but everyone has to do that, even the players you can't see even though they are on the same football field with you. Then as some threshold of a few hundred thousand goals is reached, the goal counter increments by one.
You find little bits of leather and string which you can collect. A sewing specialist on the side of the field is able to take these scraps, once you have collected enough of them, to make you a new soccer shoe that allows you to run 4% faster, but at the cost of driving a nail into your big toe.
Still it's an amazing stadium and the football physics are the best.
