Sure, here's an example of a simple game implemented as a single HTML file using JavaScript and enclosed in script tags. It is a game where you navigate a 3D landscape using smartphone controls and uses pictograms for visual elements:
Please note that this example is a starting point and doesn't implement the full functionality of a 3D game. It provides a basic structure to get you started with creating a 3D landscape game using JavaScript and HTML canvas. You'll need to further implement the game logic and rendering based on your specific requirements.