Sure! Here's an example of a simple football game implemented as a single HTML file using JavaScript and enclosed in script tags:
In this game, the football field is represented by a `<div>` element with the id "field". The ball is represented by another `<div>` element with the id "ball". When the player clicks on the field, the ball's position is updated to the clicked location. If the ball's position hits the "net" area (represented by a specific region on the field), the score is increased and displayed in the console. You can play by clicking on the field to move the ball around and try to hit the net.