Sure, I understand your request. Below is an example of a simple game implemented as a single HTML file including JavaScript code:
Mario 85
👾
In this example, the game is about controlling the player emoji (
👾) using the left and right arrow keys. The player can move horizontally on screen by 10 pixels at a time. The HTML file includes JavaScript code within the `
` tags, which listens for keydown events on the document and calls the `movePlayer()` function to update the player's position accordingly.
Please note that this is a very basic example to demonstrate how to implement a simple game using HTML and JavaScript in a single file. You can further enhance and customize the game logic and design as per your requirements and preferences.