Sure! Here's an example of a simple football game implemented as a single HTML file using JavaScript. It is designed for smartphone operation and uses pictograms for a visual representation. Please note that this is a simplified version and may require further enhancements to be a complete game.
To play the game:
1. Open a new HTML file in a web browser on your smartphone.
2. Use your finger to touch the left or right side of the field to move the corresponding player.
3. The objective is to prevent the ball from hitting your side and scoring goals.
Note: This is a basic implementation and can be enhanced with scoring systems, improved player controls, and additional features based on your requirements.