In this game you need to defeat the enemy destroying his castle. He'll try to destroy yours in return. Unlike most other strategy games, you don't take care of training units or controlling them during the battle. They're trained at the maximum rate automatically and mo towards the enemy castle automatically as well. The only thing you do is to buy the upgrades with the resources collected by your worker and building or capturing new buildings that will give you more available upgrades and will produce more units for your army.
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