Sure! Here's an example of a simple implementation of the game "Sonic the Hedgehog 2" with Dark Sonic in a single HTML file using JavaScript. Please note that this implementation is minimal and won't include advanced gameplay features.
To play the game on a smartphone, you would need to implement touch/motion detection and update the player's position accordingly. This implementation provides a basic structure for the game and displays Dark Sonic as a pictogram on a canvas. You would need to replace the "emozi_all/play.png" with the actual path to the Dark Sonic pictogram.