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This work introduces InfraLearn, a gamified learning platform designed to teach non-computer science students foundational background in cybersecurity for critical infrastructure. InfraLearn simulates attacks on a Distributed Energy Resource (DER) device, modeled after the Enphase Gateway solar monitor and implemented using a Flask-based API. Three prototype scenarios are developed: API spoofing, unauthorized remote shutdowns, and Living-off-the-Land (LoTL) downgrade exploitation. These scenarios are derived from real-world vulnerabilities in DER systems and integrated into a narrative-driven, web-based platform. Students interact with pre-configured virtual machines, guided code templates, and checkpoint quizzes, with optional AI support that reinforces comprehension while minimizing the need for prior programming experience. By situating cybersecurity concepts within the context of energy systems, InfraLearn makes abstract threats tangible and emphasizes the ethical application of defensive skills. This work demonstrates a scalable approach to engaging future engineers in securing critical infrastructure.