The app works by providing the user with challenges centered around sustainability - for example, packing lunches in reusable containers, rather than purchasing a packaged lunch. Once challenges are completed, users earn points that can be traded for rewards (discounts to products from sustainable partners!). Combined points also contribute to users' place on the campus leaderboard, allowing users to compete with their friends. This gamification-based system will ultimately create behavioral nudges towards more responsible waste consumption on campus.