It is a type of action very similar to the challenge: it consists of carrying out a sustainable action ( widely speaking: beneficial for the environment, society, health…), which will be justified by uploading a photo or comment to the app. The aim of the self-challenge is to publish the individual actions of each user, demonstrating their commitment to sustainability and, in this way, encourage their peers to do the same. Unlike normal challenges, there is no catalogue of self-challenges. All users can make as many self-challenges as they want throughout the programme. Each self-challenge has an associated score of 1 point.