The scavenger hunt though the city is arbitrary, and the setting, which originates in England, has been transferred lovelessly one-to-one without adaptation. GPS tracking is inaccurate and extremely laggy.
If you then enter alternative, but equally correct answers (like „parking garage“ instead of „car park“) in the puzzles, you‘ll get 3 penalty minutes right away. This is frustrating.
Nowhere in the app is it explained what it means to assign a character as „informant“. Even if you solve all puzzles and find all clues, in the end it‘s just guesswork: for every possible suspect you can construct a coherent story in which he is the killer, especially if you take into account that witnesses sometimes just don‘t tell the truth.
Anyway, the app is designed in such a way that you basically only get punishments, but never rewards, no matter how well you perform in the puzzles. This may appeal to gamers with a penchant for sado-maso, but it goes against every principle of game design.
The aspect that is most annoying, however, is that the group cannot finish the game should ONE of the members run out of battery during the game. And the power consumption of the app is by no means low.
So if you want to participate in one of those overpriced events (which I advise against), you should bring a couple of power banks.