Sure, here's an example of a simple text-based game implemented as a single HTML file using JavaScript:
In this example, the game starts with a prompt asking the user to type "chat" to hang out and chat with the AI. The user's input is then checked, and if it matches the expected input, the game ends and a message is displayed. Otherwise, an error message is shown, and the prompt is repeated until the correct input is entered. Finally, a "Game over" message is displayed.
Please note that this is a very basic example and can be further extended and enhanced according to your requirements for a more interactive and enjoyable gaming experience.