As an AI text-based model, I can provide you with a basic example of how you can create a simple game using JavaScript within an HTML file. However, please note that creating a full-fledged game like "GTA 6" requires advanced programming skills and is beyond the scope of a single response. The example below will demonstrate a basic game structure:
Please note that this is just a basic skeleton to get you started. You will need to add your own game logic, images, and interactions to create a more interactive and exciting game experience. Additionally, creating a full game like "GTA 6" would require much more complex code and a significant development effort.