Sure! Here's an example of a text-based RPG game implemented as a single HTML file using JavaScript within script tags:
This text-based RPG game allows the player to choose between fighting or exploring. The player can fight against an enemy (a Goblin in this case) and gain experience points upon winning. The player can also choose to explore, although the exploration logic needs to be implemented according to your game design. The game is played by answering prompts and receiving alerts with game information.