Sure! Here's an example of an idle game implemented as a single HTML file using JavaScript, enclosed in `` tags:
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<h1>Idle Game</h1>
<h2>Click the button to earn points:</h2>
<button id="clickButton">Click Me!</button>
<h3>Points: <span id="points">0</span></h3>
In this game, the player earns points by clicking the "Click Me!" button or by waiting for points to automatically increment every second. The current points count is displayed on the screen. Feel free to modify and enhance the code as per your game requirements.