Sure, I can help you create a single HTML file that contains JavaScript to implement a game where you can play other games by loading their HTML files. Here's a sample code for you:
Welcome to Game Center
In this code, we have an initial game center page with a list of available games displayed as clickable buttons. When you click on any game button, it will call the `loadGame` function and load the respective game file into an iframe dynamically.
To add more games, simply add new `<li>` items with buttons inside the `#gameList` element, and modify the `onclick` event to pass the correct game file path.
Please note that you'll need actual game HTML files (`game1.html`, `game2.html`, etc.) in the same location as this file for the games to load properly. The above code serves as a template for the game center structure.
Feel free to modify the code and add more features as per your specific game requirements.