Sure, I can help you create a simple game using JavaScript that can be played as a finished game. Below is an example of a guessing game where the player tries to guess a number between 1 and 10:
To play the game, open the above code in any web browser. It will prompt you to guess a number between 1 and 10, and then provide feedback on whether you guessed the correct number or not.
Please note that this is a basic example and you can further enhance the game with additional features and graphics based on your requirements.