If you have the VISTA operating system and the audio is not working properly, please contact us immediately.
It might occur that some of the symbols/keys (required to unlock doors/puzzles during the game) cannot be selected or are just not available. This is NOT a glitch, but a protection that takes place if some of the information or objects required to unlock a door/puzzle have not been obtained yet. If all the information or objects have been correctly obtained, relevant symbols/key will appear as they should.