If growth can be placed in the castle tower and the hero on each floor.
The city's archer is becoming much more powerful as more updates.
More than 120 heroes can use their skills.
Some heroes are made to give a strong city archers, another hero is the cursed enemy.
This strategy is important because only one hero can be mounted up to nine.
hero promotion system
Supported Android Devices : [4.1–4.3.1] Jelly Bean - [4.4–4.4.4] KitKat - [5.0–5.0.2] Lollipop - [6.0 - 6.0.1] Marshmallow - [7.0 – 7.1.1] Nougat - [8.0-8.1] Oreo -  Pie