Sure, here's an example of a simple text-based game called "Risk: Global Domination" implemented as a single HTML file using JavaScript and enclosed in script tags:
Risk: Global Domination
This is a simplified version of the Risk game where players take turns and try to conquer territories on a world map. Each player's turn is indicated at the top, and the countries owned by the current player are displayed. The game ends when all the territories are conquered, and the winner is announced. The game can be replayed by clicking the "End Turn" button.
Please note that this is a basic implementation to give you an idea, and you can customize and enhance the game as per your requirements.