Sure, here's an example of a simple calculator simulation game implemented using a single HTML file with JavaScript:
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This code creates a simple calculator game where users can input numbers and perform basic mathematical operations like addition, subtraction, multiplication, and division. The game has a visual display for the calculator screen and various buttons that users can tap on to input numbers and operations. The current number being entered is displayed on the screen, and when the user taps the equal (=) button, the calculation is performed and the result is shown on the screen.