Sure! Here's an example of a Snake game implemented as a single HTML file using JavaScript:
To play the game, you can copy and paste the above code into a new HTML file, save it with a `.html` extension, and open it in a web browser. The game will start automatically, and you can control the snake's direction using the arrow keys on your smartphone's virtual keyboard. The objective is to eat the food and avoid hitting the walls or the snake's own body. If the snake collides, the game will reset. Enjoy playing!