Sure! Here's an example of a simple game implemented in a single HTML file using JavaScript. Please note that this is a basic implementation and can be further customized to fit your specific requirements.
In this game, you'll see a green square in the middle of the screen. Each time you click on the square, you'll earn a point, and the score will be displayed in an alert box. You can customize the game further by adding pictograms, sound effects, etc., based on your preferences.