The PrättiApp is a mixed-reality app for smartphones, with which families with children get to know the cultural treasures of the Alpine region of Prättigau in a playful way. The app is an educational game, which is played locally in the various villages of the mountain region. The local culture and nature is expanded with digitally retrievable information and tons of lovely illustrated cartoons. Together with their parents, the children learn all about the lively culture of the Prättigau. The project is part of the Swiss Cultural Challenge 2018.