Sure! Here's an example of a simple game implementation in a single HTML file using JavaScript. Please note that this is a very basic version and can be expanded upon for a more complete game.
In this game, you control Mario (red square) using the arrow keys on a smartphone. SMG3 (red), Bob (red), and Swag (red) characters move randomly within the game area (black border). If Mario collides with any of the other characters, you will lose and the positions will reset. You can replace the red squares with pictograms of Mario, SMG3, Bob, and Swag by using their actual image URLs in the CSS section.