This master's thesis is a UX design project, and it concentrates on applyingGamification elements to motivate children with type 1 diabetics to use the selfmanagementcoach application.The project is about iterating and re-designing the existing mobile application calledDiabetesNinja. The design process focuses on three matters: tracking carbohydratesintake, educating about diabetes type 1, and teaching children with T1D to estimatethe amount of food and that way to help to develop a valuable life habit.This project focuses on 9 – 12-year-old children with T1D and has been completed incollaboration with Stratiteq. The double diamond design model included co-design,sketching and wireframes methods.The project contributes to solving treatment challenges and supporting children withT1D. As a result of project, there are now better possibilities to educate children withT1D through gamification elements in interaction design.