Mozart Requiem is a very bad PC port, that comes with lots of game breaking bugs, like items disappearing from puzzles that never reappear back even with loading a previous save.
It oddly keeps the state of the puzzle and the only help was loading a save from a different chapter.
So it's highly advised to save very often, while it normally only saves the second time you do so.
The game itself is a point and click with totally outdated graphics and movements that look so unnatural that you would normally call a doctor.
It comes with quite a few annoying minigames that were ported so badly that most of them have bugs and are no fun.
An example is the baton minigame where you have to follow a circle with your cursor and keep the cursor inside, which sometimes even is impossible as the circle can move faster than the player with the cursor.
The card minigame where you have to aim for a score of 31 can bug a lot if you click somewhere to fast the graphics of a card can stay the blocking your view.
It's also annoying that you have to win lots of rounds to progress while the others have to lose more which is totally luck based, which doesn't feel like a nice thing in a point & click game.
Finding items can be very annoying too as the hotspots are very small without much help and the puzzles being very tedious.
Somehow they even wanted to make things worse for us having to play one more chapter than Playstation users for their platinum.
So in summary a game that already looked outdated and uninteresting ported without any thought what needs to be adapted to work with a controller combined with tons of bugs.
Any real developer would be too ashamed to even publish this and therefore it doesn't even deserve one star.
.5