Similar to a role-playing game character, the Home City is persistent between games, meaning that upgrades gained through separate games can be applied and stay applied for as long as that particular city exists.
Mirip dengan sebuah karakter role-playing game, Home City tetap ada di antara permainan-permainan, maksudnya bahwa peningkatan yang diperoleh lewat permainan-permainan yang berbeda dapat digunakan dan tetap tergunakan selama kota tersebut ada.