Sure! Here's an example of a simple game implemented as a single HTML file using JavaScript. The game is called "Guess the Pictogram":
To play the game, simply open the HTML file in a web browser on your smartphone. The game will display a pictogram and prompt you to enter your guess in a text field. After submitting your guess using the "Submit" button, you will receive a message indicating whether your guess is correct or not. You can also reset the game anytime by clicking the "Reset" button. Enjoy the relaxing game!