This compendium brings together five policy briefs produced within the framework of the GREAT(Games Realising Effective and Affective Transformation) project, an international researchinitiative exploring the potential of gaming to foster public engagement and enhance dialoguebetween citizens and policymakers on pressing societal issues. Each brief reflects a distinctdimension of this work: 1) the adoption of game-based methods to surface citizen perspectivesand inform policy design; 2) the evolving role of the global gaming industry in advancingenvironmental sustainability; and 3) in-depth case studies demonstrating how interactive dilemma games can support policy innovation in areas such as urban green infrastructure or green jobs foryouth. Together, the five documents offer complementary insights into how game-based tools andparticipatory design can be leveraged to support inclusive, data-driven policymaking in the contextof climate change and sustainable development. This collection is intended as a resource forpolicymakers, researchers, and stakeholders committed to harnessing digital culture fortransformative civic and environmental action. They have been strategically distributed tostakeholders and are available on Zenodo (see references at the end of the document), where theyhave already reached around 1.000 views in total.