Enigmarium Zagreb: Unlock Zagreb

Have you ever heard of the Bloody Bridge (Krvavi Most)? It was named after the fierce battles fought between the two neighbouring settlements, the diocesan Kaptol and the free royal settlement of Gradec (or Grič). It is also linked to the legend of the Duchess Ružica Gising and the Knight Pavo Slavinić.
Do you dare to undergo six tests of chivalry that will show whether or not you’ve got what it takes to be a knight?
The evil Duke Grdun, who wants beautiful Ružica for himself, is on his way, so you must be quick! You have only one hour!