Three games in the main series are: "Age of Empires", "Age of Empires II" and "Age of Empires III". There is also a spinoff game called "Age of Mythology". It is similar to "Age of Empires", but players can also control monsters like the cyclops. After Ensemble Studios had closed down, another game called "Age of Empires Online" was made. It is "free to play", which means that you do not have to pay money to play the game, but you can buy things in the game if you want to.