Sure! Here's an example of a simple 3D pong game implemented as a single HTML file using JavaScript. It utilizes a combination of HTML5 canvas and JavaScript logic to create the game environment and handle game mechanics.
Keep in mind that this is a very basic implementation, and you can enhance it further based on your requirements.
To play the game on a smartphone, you can open the HTML file in a web browser on your device. The game uses touch input to control the paddle's movement vertically. The goal is to bounce the ball off the paddle and prevent it from hitting the walls.
Please note that this is a basic version of the game and may require additional features depending on your specific requirements.