Sure! Here's an example of a Crystal Ball telepathy game written in a single HTML file using JavaScript:
Crystal Ball Telepathy Game
Think of a number between 1 and 10, and let the crystal ball read your mind!
In this game, the user is asked to think of a number between 1 and 10. The JavaScript code then generates a random number between 1 and 10. It prompts the user to enter their guess, compares it with the randomly generated number, and displays the result accordingly.
Please note that this is a simple example and can be further enhanced with more features and interactivity based on your requirements.