Bring some mermaid cheers to the castle through additional special modifications. Starting from the basic 4 walls and roof, turn this flat building into an underwater castle wonderland! First, select the roof and steps, then choose the window. Wrap the house in some lights to make it bright and beautiful. Why not add a mermaid to the garden? Now click on "Show" to see your castle. Want to go again? Just click reset to start over...