Sure! Here's an example of a simple Pong game implemented in a single HTML file using JavaScript, enclosed in script tags. The game can be played on a smartphone and utilizes pictograms for the visual elements.
This code sets up a simple game of Pong where the user paddle can be controlled by dragging on a smartphone screen. The ball bounces off the paddles and the walls, and the computer-controlled paddle tries to follow the ball's position. The game loop is initiated by calling the `startGame()` function, and the game updates are handled by the `update()` function. The necessary drawing functions and collision detection logic are included as well.