As an AI text-based model, I can provide you with an example of a simple game implemented as a single HTML file using JavaScript. Here's an example:
⚛️
In this example, we have a simple game where a particle (represented by the ⚛️ pictogram) moves to a random position within a container element every second. The particle's position is randomized by generating random X and Y coordinates within the container's boundaries, and then applying those coordinates to the particle's CSS `left` and `top` properties.
You can copy this code into an HTML file and open it in a web browser to see the game in action.