Sure, here's an example of a three-player game implemented as a single HTML file using JavaScript and enclosed in script tags:
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In this game, there are three players represented by pictograms: a boy, a girl, and another boy. The players can move horizontally on touch input. Each player moves 10 pixels to the right when the corresponding section of the screen is touched. The game is designed for smartphone operation, adapting to touch input.
You can copy this code into a single HTML file and open it in your web browser to play the game. Touch different areas of the screen to move the respective players.