Sure! Here's an example of a simple text-based RPG game implemented as a single HTML file, using JavaScript and enclosed in script tags.
In this game, you can enter your name, explore different areas, fight enemies, collect gold, and restore health. The game continues until your health reaches zero or you choose to quit. At the end, a summary is displayed with your name, remaining health, and gold.
This is a basic example, and you can expand upon it by adding more features, actions, and interactions with the game world.