Guests of the St. Petersburg Cappella are in for a unique adventure: an exciting detective game where reality intertwines with history. Participants will gradually unravel the mystery of the missing score, visit closed halls, and get acquainted with the musical legends of the past. The St. Petersburg Cappella invites you to an unusual adventure - the detective game "The Mystery of the Missing Score." This captivating journey into the world of history and music will place participants in an alternative reality filled with puzzles, unexpected twists, and intellectual challenges. The game begins with the mysterious disappearance of the score of rare musical works. To retrieve it, players must follow a chain of clues and solve puzzles. One of the main advantages of the game is the opportunity to visit the Cappella's halls, which are usually closed to the public. Here, one can learn about the great composers whose names are inscribed in the history of world music, as well as about the mysterious events that took place within these walls. The "learning through entertainment" format makes the event interesting for various age groups. The use of multimedia technologies helps create an atmosphere of complete immersion, where participants can not only observe but also actively engage in the investigation. Each time, the game unfolds differently, depending on the players' decisions. The poster for St. Petersburg is available on KudaGo.