Under direction of medical professionals associated with the National Child Traumatic Stress Network, a mobile game was developed for children ages 10-12 to teach the Cognitive Triangle concept of feelings, thoughts, and behaviors. This triangle is an essential component of Trauma-Focused Cognitive Behavioral Therapy (TF-CBT). A storybook experience with minigames was quickly prototyped, but first playtests showed a lack of engagement with children. The game was revised to emphasize side-scroller platform advancement where success in a level was tied intrinsically to cognitive triangle classification. Children rated the game highly across a series of playtests. The game has potential to be used by clinicians delivering TF-CBT as an appealing exercise for children.