Sure! Here's an example of a simple FNAF-style game implemented in a single HTML file using JavaScript.
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This code sets up a simple FNAF-style game where the player's character (represented by a bear emoji) moves based on the device's orientation. The game character's movement is controlled by tilting the smartphone. The bear will move horizontally based on the device's beta orientation and vertically based on the device's gamma orientation.
Please note that this is a very basic example and not a complete game. You can extend it further by adding gameplay elements, animations, sound effects, and more according to your requirements.