Sure! Here's a simple implementation of the classic Snake game using JavaScript and HTML tags, all in a single HTML file. To make it suitable for smartphone operation, I have added touch events to control the snake's movements. The game uses pictograms for simplicity.
Snake Game
To play the game, you can simply save the above code in a ".html" file and open it in your smartphone's web browser. The user can control the snake's movements by swiping on the game board.
I hope you enjoy playing the Snake game! Let me know if you have any further questions.