The author created an SMS-powered Star Wars trivia game using PHP and Twilio, allowing players to receive questions via text message and respond with answers. The game uses session variables to track player names, scores, and correct answers, and can be hosted on any server with a PHP file. After receiving a question, the player responds with their answer, which is compared to the correct answer to determine if they are correct or not. The game keeps track of the player's score and provides feedback, and allows for easy modification by adding features such as a public leaderboard, accepting multiple correct answers, or adding picture questions.