In this code, we have implemented a simple Pac-Man game using HTML, CSS, and JavaScript. The game can be played on a smartphone by using the arrow keys to move Pac-Man around the screen. The game container is a black square where Pac-Man (represented by a yellow circle) moves around. The movement logic is handled by the `movePacman` function, which updates the position of Pac-Man based on the arrow key pressed. The ghost in the game is represented by a red circle. The game is enclosed in the script tags and can be saved as a single HTML file.