Challenges in Evaluating Players' Interaction with Digital Games -- The pursuit of fun in digital games: From the sandpit to the console and beyond -- Business Model for Indie Studios in Game Software Ecosystems -- Games as Mediating Platforms in an Open and Digital World -- Balancing Game Elements, Learning, and Emotions in Game Design -- Enhancing Students' Learning Experience through Gamification: Perspectives and Challenges -- Ethics and Games, ethical games and ethics in game -- Challenges for XR in Games -- Stimulation of the Executive Functions Mediated by Digital Games: Current Challenges in the School Context -- Perceptual Analysis of Computer Graphics Characters in Digital Entertainment -- Nine Challenges for Immersive Entertainment -- Strategies to Promote Stakeholders' Autonomy while Creating Educational Digital Games.