Sure! I can help you create a simple game using JavaScript in a single HTML file. Here's an example of a game where you have to catch falling objects using a smartphone:
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To play the game:
1. Save the above code to a file with the extension `.html`.
2. Open the file in a web browser on your smartphone.
3. Tap on the falling objects (represented by gift pictograms) to catch them and increase your score.
4. Avoid letting the objects reach the bottom of the screen, as it will decrease your score.
Feel free to customize the game by modifying the pictograms or adjusting any other aspects of the code. Enjoy playing the game on your smartphone!