The rapid growth of mobile gaming has shaped how and foreign influences, leaving Philippine mythological teenagers consume digital content, often favoring foreign - monsters overshadowed by mainstream entertainment. Video themed games over culturally grounded narratives. This shift games at the time focused heavily on action, fantasy, and has contributed to the declining awareness of Philippine competition, rarely incorporating elements of Filipino folklore among youth aged 13 – 19. This study presents the folklore, which further diminished awareness of these design and development of Eternal Quest , a 2D platform - based legendary creatures. Without efforts to preserve these myths, action - adventure mobile game that integrates Philippine mythological creatures into interactive gameplay. The game the unique stories and cultural significance of these features side - scrolling mechanics, enemy encounters, boss creatures might soon have disappeared from the collective battles, resource - based sub - weapons, checkpoints, and life and memory of Filipinos. health systems to provide an engaging experience. The system To address these issues, the team proposed Eternal was developed using the Godot Engine and Aseprite. Usability Quest, a platform - based action - adventure mobile game that was evaluated using the System Usability Scale (SUS) to assess brought Philippine mythological creatures to life in an action - functionality, ease of use, and overall user experience. Results packed adventure. Players explored different stages, facing indicated t hat the game was functional and engaging, with recommendations for improvement in interface clarity and monsters such as the Tiyanak, Aswang, Santelmo, player guidance. The findings suggest that mobile games can Manananggal, Nuno sa Punso, Mangkukulam, and Amalanhig serve as effective platforms for cultural awareness and folklore as enemies. Each level presented unique challenges, battles, preservation. and thrilling boss fights, allowing players to engage with Filipino mythology in an interactive way. With simple co ntrols