Sure! Here's an example of a simple Snake game implemented as a single HTML file using JavaScript:
Snake Game
You can copy the above code and save it as a .html file. Then, you can open it in a web browser (preferably on your smartphone) to play the Snake game. The game board is displayed as a 300x300 px area, and the snake is represented by green squares while the food is represented by a red square. Use the arrow keys on your smartphone keyboard to control the snake and eat the food while avoiding collisions with the walls or itself. Have fun!