Sure! Here's an example of a simple game implemented as a single HTML file using JavaScript and enclosed in script tags. The game is played using touch gestures on a smartphone and includes simple pictograms:
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This simple game displays a game area represented by a square div with a gray background. When you touch/click on the game area, the score increases by one and is displayed in the center of the game area.
Note: This is a very basic example, and you can expand and modify it to create more complex games with different levels, rules, and graphics.