Sure! Here's an example of a simple game that runs as a single HTML file and uses JavaScript to change the color of a square between white and black. It is designed for smartphone operation and utilizes pictograms.
In this game, a square element is created and initially set to have a white background-color. When the square is tapped/clicked on a smartphone, the background color of the square will toggle between white and black. This creates a simple interactive game where the goal is to change the square's color. The game is enclosed within `
` tags for the JavaScript code.