Sure! Here's an example of a simple billiards game implemented as a single HTML file with JavaScript code enclosed in script tags:
This code sets up a billiards game on a canvas element. The game includes a red ball that moves within the canvas boundaries and bounces off the walls. You can view and interact with the game on a smartphone by opening the HTML file in a web browser.
Please note that this is a basic example, and you can enhance it further by adding more features, rules, and interactions based on your specific requirements for a complete game.