Sure, here's an example of a simple game implementation using JavaScript embedded in an HTML file:
Find the Letter
To operate the game on a smartphone, simply open the HTML file in a web browser on your smartphone and tap the pictograms to make a selection. The objective is to find the hidden letter, represented by the "??". If you click on the correct pictogram, you'll get a congratulatory message and the game will restart. If you click on the wrong pictogram, you'll receive a message to try again.