In the game "Historical Detective: Death at the Ball," players take on the roles of detectives assigned to investigate this challenging case. To play, you will need a mobile phone with a QR code scanning function – this is essential to determine how close your guesses are to the truth at the end. You are limited to 24 moves – so you must carefully plan your actions and analyze each step. Interview friends and relatives of the victim? Carefully examine the crime scene? Gather witness testimonies? Extract information from the servants or the homeowner? There are many options, each bringing you closer to the solution. The question is whether you can piece together a coherent picture from bits of truth and clues…