Xin Wen¹ and Garret Washburn², ¹Chuangyang International Education, China, ²California Baptist University, USA

Prescription stimulant misuse remains common among U.S. college students, with measurable harms to sleep, cardiovascular health, and downstream academic performance, yet most existing prevention tools are static brochures or single-session workshops that under-engage digital-native young adults. This paper presents MindBalance, a Flutter mobile application that integrates four components ' a Daily Reflection check-in, a curated ten-lesson Brain Science library, a personalized 7-day Challenge game powered by OpenAI's gpt-4o-mini, and an editable user Profile ' through Firebase Authentication and Cloud Firestore. The Challenge prompt is conditioned on the user's age and most recent Daily Reflection, so scenarios match current vulnerability (e.g., a sleep-deprivation dilemma after a four-hour night). Internal validation showed personalized prompts produced substantially higher contextual relevance than non-personalized or hardcoded baselines, and simulated playthroughs confirmed the game's stat-delta mechanics encode the intended educational message. The system is a reproducible template for adaptive, AI-assisted health-behavior interventions.

Prescription Stimulant Misuse, Mobile Health (mHealth), Large Language Models, Gamification