This Python program implements a football game and score management system. The program allows users to set difficulty levels, play a penalty shootout game against an AI opponent, view leaderboards of high scores sorted by username, and update scores after each win. It uses functions to handle gameplay, data input/output to a CSV file for high score tracking, and a main loop for continuous play. The program provides instructions, tracks individual goals and game results, and allows changing users to access different score profiles.