Sure! Here's a simple implementation of Pong as a single HTML file, using JavaScript and enclosed in script tags. The game can be played on a smartphone and uses pictograms for the visuals. Please note that this is a basic implementation and can be further enhanced with additional features, controls, and styling.
To play the game, simply copy and paste the code into an HTML file, save it, and open it in a web browser on your smartphone. The game should start automatically, and you can control the paddle's movement by touching and dragging on the screen. The objective is to prevent the ball from hitting the right side of the canvas by moving the paddle with your finger. If the ball hits the right side, a "Game Over" alert will be displayed, and the game can be restarted by reloading the page.