Sure! Here's an example of a simple game implemented as a single HTML file using JavaScript and enclosed in script tags:
This game includes a score counter represented by a div element, a play button, and a game container. When the play button is clicked, the game begins and clicking on the game container increments the score. The score is displayed dynamically using JavaScript. The game is designed to be played on a smartphone.
Please note that this is a basic example just to demonstrate the structure of a simple game using HTML, CSS, and JavaScript. You can modify and enhance it further to suit your specific requirements and add more game features.