Sure! Here's an example of a simple math game implemented as a single HTML file using JavaScript:
Math Game
In this game, the player is presented with a math question ("5 + 3 = ?") and an input field to enter their answer. They can click the "Submit" button to check if their answer is correct.
If the player guesses the answer correctly (in this case, it's 8), they earn 5 points and their score is updated. Once the player reaches a score of 10, a message pops up saying "Wow, you're smart!"
Note: This is a basic example to showcase the implementation of a math game using JavaScript in a single HTML file. You can customize and enhance it further based on your specific requirements.