This session builds on the foundation established in past Little Hands, Foul Moods, and Runny Noses sessions. Children have unique intellectual and physical needs, which designers must take into account in order to create engaging gaming experiences. This session provides development guidelines for mobile game design for children (ages 0 to 12), with particular emphasis on developmental milestones, usability, and interaction design findings that are relevant to game developers. Findings are grounded in industry and academic research. Participants will take away findings from existing research on kids and games that can be incorporated into their own game development projects. The discussion will be focused on mobile games, but most findings can be generalized for any child gaming project, regardless of platform. The findings will address children's gaming needs (which are significantly different from older audiences), developmental psychology, UI and input design considerations, usability, and use of storytelling devices. Additionally, participants will have access to a summary document with a list of recommended resources, which includes books and research articles.