In The Settlers Online: Castle Empire you are the king of a fledgling empire, seeking to become mighty and great. Develop your land to produce the raw materials needed for construction, exploration, and combat. Join with your friends to create a thriving land, and go on exciting adventures together. Repel invasions with your forces, and grow a kingdom into an empire.

The Settlers Online: Castle Empire is an RTS that has you building your city from the ground up. Various buildings are available to gather wood, stone, and provide food for your population.

The game is unique that your friends can help you do multiple things, especially adventuring for fun and profit. The animations in the game are smooth and believable, even if the graphic style might be considered cartoon-like.