You have enterd through Battlements
You will not be able to continue until you answer this question

From the battlements of the castle you can see the sea in the distance. How is that sea called?

              -   North Sea                            

-         Atlantic Ocean           

-         Irish Sea                     

-         Baltic Sea                     

Three of the clues are false and only one of them is true. Only the valid one will lead you to the second part of the castle.