When I am at Sogdian Rock, the Fortress, there is no hint and can't do anything. Seems to be locked up. What to do?
Legends of the Cursed is a bundle that contains 4-5 games from this series. You need to properly identify the game you're playing and then use Google to search for a walkthrough. There are a lot of these guides published on the Internet. You need to use Legends of TITLE_HERE walkthrough in Google and you will have the possibility to find the solution.
