In this scavenger hunt with a hint of Escape Game, you'll need your phone, with a rather special companion waiting for you to take you through the streets of Chamonix to solve the riddles... This companion is none other than Bénédict De Saussure, physicist and, more secretly, alchemist, who has just launched the Course au Mont-Blanc, to find climbers who will help him scale the summit of the “cursed mountain”. But De Saussure's main reason for going to Mont Blanc is that legend has it that a mysterious crystal lurks there, and this could well be the key to the elixir of long life that the scientist is so keen to create... Step back in time to the 1780s, and help Chamonix residents Jacques Balmat and Michel Paccard win the Mont-Blanc Race! Scour the streets of Chamonix in search of the tests and riddles devised by De Saussure, and solve them alongside them to reach the end of the quest!