This study aims to develop a preliminary model for the content validation of serious games, specifically to assess two cybersecurity games designed for children aged 8-13 years as part of the Erasmus+ project "SuperCyberKids". Using a scoping review of databases from pedagogy, psychology, and computer science, we identified current trends in creating and validating content for serious games. The study proposes a three-phase model for content validation: initialization, theoretical content validation, and practical content validation. This model is intended to ensure that serious games meet the defined learning objectives and provide effective learning experiences. Subsequently, we conducted a survey with N=20 experts based on the scoping review, who were asked to evaluate the content of two cybersecurity games, Spoofy and Nabbovaldo. The results showed that both games generally provided good protection across the content topics. [For the full proceedings, see ED665357.]