Sure! Below is a sample code for a simple snake game implemented as a single HTML file using JavaScript and pictograms:
To play the game, you can copy the above code into a new HTML file, save it with a `.html` extension, and open it in a web browser. The game will be mobile-responsive and can be played on a smartphone. Use the arrow keys on a physical keyboard or virtual arrow buttons on a smartphone to control the snake. The objective is to eat the red food while avoiding collisions with the walls and the snake's body.