Sure! Below is an example of a falling sand game implemented as a single HTML file using JavaScript. The game is enclosed within script tags and can be played as a finished game. The game mimics the behavior of particles falling and interacting with each other, similar to the popular game "The Powder Toy".
Please note that this is a simplified version of the game, and you can further enhance and expand it based on your requirements.
To play the game, simply copy the above code into a new HTML file (e.g., "falling_sand_game.html") and open it in your smartphone's web browser. The game will start automatically, and you'll see particles falling and interacting on the screen.