Sure, I can help you create a challenging game that includes multiple games in a single HTML file. Here's an example of a JavaScript-based game with various levels. Since I cannot directly provide a downloadable HTML file, you can copy and save the code provided into an HTML file on your system.
In this example, I've provided a basic structure for a game collection using HTML and JavaScript. You can add your own game logic and pictograms within each game's `start` function. Each game has a name which will be displayed when the game starts. The `loadGame()` function manages the loading of each game level and advances to the next level once a game is completed.
Please note that this is a basic template, and you will need to add your own game logic for each individual game. Feel free to customize and extend this code to match your specific requirements. Good luck with your game development!