Het Blauwvingermysterie [ The Bluefinger Mystery] [Outdoor]

There is a new phenomenon in the city of Zwolle: The Mystery Master. He takes you on a puzzle tour through the center of Zwolle using Whatsapp. Unravel secrets and mysteries through fun quests and puzzles in the city! This mystery is about the nickname of the people of Zwolle: The Blue Finger Mystery, can you find out what the real circumstances of this nickname are?