Sure! Here's an example of a simple billiards game implemented as a single HTML file using JavaScript:
This HTML file creates a canvas element that serves as the game board. The JavaScript code draws a bouncing ball on the canvas and allows the player to control its movement by touching the screen on a smartphone. The ball will reverse its direction when hitting the edges of the canvas. You can save this code as an HTML file and open it in a web browser to play the billiards game.