As an AI language model, I can provide you with a sample code for a text-based game implemented as a single HTML file using JavaScript. However, please note that the game itself is a simple example and may not match your requirements exactly. You can customize and expand upon it as per your needs.
Here's an example of a text-based game implemented using script tags in a single HTML file:
In this game, the player assumes the role of a country's leader and can make choices to implement policies, improve infrastructure, and manage finances. Each choice affects the player's health and money. The game is played through prompts and alert messages.
Please note that this is a basic example, and you can enhance it further by adding more features, graphics, or complexity based on your requirements.