Sure! Here's an example of a simple billiards game implemented in a single HTML file using JavaScript:
This implementation creates a canvas element where the game is rendered. It uses the `getContext` method to get the 2D rendering context and draws a ball using the `arc` method. The ball's position is updated in the `update` function, where collisions with walls are checked and the ball's velocity is reversed accordingly. The game loop is handled using the `requestAnimationFrame` method.