Sure! Here's an example of a simple Snake game written in a single HTML file using JavaScript:
To play the game, simply open the HTML file in a web browser, and you'll see a game board with a snake and a red food item. Use the arrow keys on your smartphone's keyboard or on-screen controls (if available) to control the snake's movement. The objective is to eat the food and avoid colliding with the walls or yourself. The game will end if you hit a wall or collide with yourself.