The principle is simple: you must be equipped with a mobile phone, and install the free Baludik application. Then, from this app, just scan the QR Code (opposite) to start the adventure. At each step, simple questions, games, clues and anecdotes take you to the next point. According to a common thread, in a quest towards the treasure of the Queen of Provence, the end of the course allows you to discover the courses of other municipalities if the desire to travel in the country of Aix takes you. A good idea for a family walk.