Sure, here's an example of a simple 3D Spider game implemented in a single HTML file using JavaScript and enclosed in script tags:
This code sets up a basic 3D scene using the Three.js library and renders a green cube (representing a spider) that rotates continuously. You can view and interact with the game on a smartphone or any web browser that supports WebGL.
This is a very basic implementation, and you can enhance the game by adding more features, interactivity, and levels as per your requirements.