Sure! Here's a simple example of a game implemented as a single HTML file using JavaScript. The game involves guessing a word represented by pictograms. It is designed for smartphone operation.
To play the game, simply open the HTML file in a web browser on your smartphone. The game will display a random pictogram, and you need to enter your guess in the prompt dialog that appears. If your guess matches the word represented by the pictogram, you'll receive a congratulatory message; otherwise, you'll be informed of the correct answer.
Please note that this is a very basic implementation to give you an idea of how you can create a simple game using JavaScript and HTML. You can refine and expand it further based on your specific requirements.