Sure, here's an example of a simple clicker game implemented as a single HTML file using JavaScript:
Clicker Game
Click the button to earn points!
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Click me!
In this game, you simply need to click the "Click me!" button to earn points. The current score is displayed in the `score` paragraph. Each time you click, the score is incremented by one and updated on the screen.
Feel free to customize this game further, such as adding levels, upgrades, or other features, according to your preferences.