This book constitutes the refereed proceedings of the 12th Joint International Conference on Serious Games, JCSG 2026, held in Valetta, Malta, during December 3–4, 2026. The 19 full papers, 6 short papers, 4 poster papers, and 4 demo papers included in this book were carefully reviewed and selected from 51 submissions. Following under topical section: Games as Epistemic Tools: Perspectives and Critical Reflections; Civic Engagement, Climate Governance, and Media Literacy; Game-Based Learning and Adaptive Educational Support; Immersive Experiences, Communication, and Collaborative Play; Serious Games for Health and Well-Being; Design Frameworks, Gamification, and Reusability; Demos; Posters.
