OpenTTD is an open-source simulation game based on the classic transport management game Transport Tycoon Deluxe. Players build and manage their own transport company, creating networks of roads, railways, airports, and shipping routes to move passengers and goods efficiently. The game features a variety of vehicles, including trains, buses, and ships, allowing for diverse strategies. Players can also expand their cities and compete against AI or other players, making it a dynamic and engaging experience. With regular updates and a strong community, OpenTTD continues to evolve and attract new fans.