Sure! Here's an example of a simple billiards game implemented as a single HTML file using JavaScript:
In this game, a billiards ball is represented as a circle and is bouncing off the walls of the canvas. The `drawBall()` function is responsible for drawing the ball, `moveBall()` updates the position of the ball, and `draw()` clears the canvas, calls the other functions, and requests an animation frame to keep the game running smoothly.
You can save this code in a file with an ".html" extension and open it in a browser (preferably on a smartphone) to play the game. You will see the billiards ball moving and bouncing off the walls of the canvas.
Please note that this is a very basic implementation of a billiards game, and you can further customize and enhance it to add game logic, interaction, scoring, and more.