As a programmer, I have created a small game using JavaScript that can be played as a finished game on a smartphone. Here's the implementation as a single HTML file enclosed in script tags:
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When you open this HTML file in a browser on your smartphone, you will see two pictograms representing particles on the screen. Whenever you click/tap anywhere on the screen, the positions of the particles will be updated randomly, simulating their movement. This simple game allows you to interact with the particles using touch/click events on your smartphone.