Mentiras Insostenibles: Reality vs. Disinformation” is an immersive Augmented Reality gymkhana that transforms the URJC Fuenlabrada Campus into a scientific investigation scenario. Participants, acting as digital investigators, must dismantle coordinated disinformation campaigns about renewable energies by completing five interactive missions. The action integrates media literacy, circular sustainability education (with focus on WEEE recycling), and digital skills, while fostering critical thinking and evidence-based reflection. Targeted at 15–18 year-old students, the activity is part of the POWER project and the European Week for Waste Reduction 2025, encouraging young people to turn misinformation into verified knowledge and sustainable action.