As promised.
I'm sorry to say that this game is NOT what I expected and will disappoint a lot of people. The premise of the story is that Mozart was not only a genius with music but also a freemason. He is in Prague to perform, but decides to visit the Prague chapter of the freemasons in his spare time. They don't accept his word that he has been initiated and he has to prove himself worthy. This is where the puzzles come in. So far, so good, but unfortunately the developers only had enough imagination for five puzzles and two mini-games and these are repeated over and over again. And worse, they're not even fun to solve/play.
PLEASE NOTE, SPOILERS FOR SOME OF THE TYPES OF PUZZLES TO FOLLOW. Not the solutions though, it's just that some people don't want to know what kind of puzzles to expect.
Some of the puzzles require musical insight and good hearing capabilities, for instance tuning an instrument or putting fragments in the correct order. Another type of puzzle is purely trial and error (although musical insight can help a little, it involves reconstructing 'messed up' sheets of music).
One mini-game is playing cards. Since it depends on luck and coincidence it can take a while to win this, which influences the flow of the game (not very realistic to play a dozen rounds of a game of cards when you are in a hurry). The worst however is a conducting mini-game. A dot 'dances' on the screen and you have to follow it with your mouse cursor. This is completely impossible with a scrollwheel-type mouse (which I have) and very hard with a normal mouse (which I bought to be able to play this game). Fortunately, you can make a few mistakes as the result influences a simple word puzzle which is easy to solve even with lots of mistakes in the conducting game. However, at the end of the game you have to perform this mini-game perfectly without any mistake. I was not able to do this even after trying a dozen times. I had to ALT-TAB out of the game to escape the continuous loop of trying again and again.
Not recommended.