Sure, here's an example of a simple game implemented as a single HTML file using JavaScript:
Mini Game
In this game, when the "Start Game" button is clicked, the game starts. The player's score increases every second, and the score is displayed using a pictogram. Once the score reaches 10, the game is over, and the final score is displayed.
Note: This is just a simple example to demonstrate how a game can be implemented using HTML and JavaScript. You can expand on this by adding more features, interactivity, and complexity based on your requirements.