ZeroCarbon Hero is a gamified app designed to help Cologne residents track and reduce their carbon footprint by breaking sustainable actions into fun, engaging levels. It tackles the challenge of motivating individuals to change their behavior by turning sustainability into a rewarding game. Users start at Level 1: Mobility Master, where they earn points for eco-friendly transportation options like biking, walking, or using public transport. Once they reach a points target, they progress to Level 2: Eco-Home Pro, which tracks energy efficiency at home, renewable energy use, and recycling habits. Finally, Level 3: Local Food Champion encourages users to consume locally by growing their own produce, purchasing directly from farmers, and reducing food miles. The app targets eco-conscious, tech-savvy citizens and will be promoted through digital campaigns and local government partnerships. It will be implemented across Cologne, supporting the city’s goal of a digital, sustainable future.