Sure! Here's a simple implementation of the classic game Pac-Man using JavaScript within a single HTML file. It is designed for smartphone operation and utilizes pictograms for visuals.
When you open this HTML file in a web browser, it will display a small game board with Pac-Man (represented by a yellow emoji) moving within the grid based on the arrow keys on your smartphone. The game loops continuously, moving Pac-Man every 500 milliseconds.