Sure! Here's an example of a simple 3D platformer game implemented as a single HTML file using JavaScript and enclosed in script tags. It is optimized for smartphone operation and uses pictograms for visuals. Note that this is a basic implementation, and you can enhance and optimize it further based on your requirements.
To use this code, you will need to create "emozi_all/player.png" and "emozi_apple.png" images with appropriate pictograms to represent the player and platforms. These images should be placed in the same directory as the HTML file.
Remember, this is a basic implementation, and you can further enhance it with more features, levels, animations, and optimizations as required for your game.