Sure! Here's an example of a simple billiards game implemented as a single HTML file with JavaScript:
This code sets up the basic structure for a billiards game using HTML, CSS, and JavaScript. You can customize the game logic and drawing functions to implement the actual gameplay, table, balls, etc. Additionally, you can make it work on a smartphone by adding touch event listeners and handling touch input instead of mouse input.
Please note that the provided code is a starting point and does not include the complete implementation of a billiards game. You would need to add the actual game mechanics, physics, and user interactions to create a fully functional game.