Sure! Here's an example of a simple 3D football soccer game implemented as a single HTML file using JavaScript and enclosed in script tags:
This simple game sets up a canvas element and uses the `getContext` method to obtain a 2D rendering context. The `ballX`, `ballY`, `ballSpeedX`, and `ballSpeedY` variables control the position and movement of the ball. The `update` function is the game loop, which calls the `moveObjects` and `drawObjects` functions to update and render the game objects respectively. The game loop uses `requestAnimationFrame` to refresh the canvas at a consistent frame rate.
When you run this HTML file on a smartphone, you'll see a red ball moving within the canvas, bouncing off the edges. You can modify and enhance the game logic to fit your desired gameplay mechanics and add pictograms or additional features as needed.