Null Vitals is a 2D horror adventure game developed as part of an academic project, aimed at delivering an immersive and strategically challenging survival experience. The game situates players in a dystopian, abandoned research facility devastated by a mysterious viral outbreak, where they must navigate through dimly lit corridors, confront hostile zombie creatures of varying types and behaviors, and solve environmental puzzles to progress. The player controls an unnamed protagonist whose objective is to uncover the dark history behind the facility’s downfall while striving to survive increasingly difficult encounters. The narrative unfolds progressively through in-game notes, audio logs, and cryptic interactions with a mysterious character, Dr. Cure, who guides the player with ambiguous hints, contributing to the psychological horror atmosphere. Developed solely using the Eclipse IDE and programmed in Java, the project emphasizes object-oriented designprinciples, ensuring modularity and extensibility of code through well-defined classes such as Player, Enemy with polymorphic behavior, Items, Interactive Objects, and Game State Manager. The game architecture is built around a state management system that smoothly transitions between various game states including title screen, gameplay, cutscenes, pause, and ending, allowing for clean separation of concerns and easier debugging. Key gameplay mechanics include a health system visualized by hearts, healing statues strategically placed for health regeneration, and an inventory system enabling the player to collect and utilize key items, weapons, and healing objects. A unique torch mechanic affects both player visibility and enemy behavior, introducing tactical decision making regarding light usage during exploration and combat. The save and load system is implemented using file serialization to persist player progress, including item collection, puzzle states, and unlocked areas, allowing for session continuity. Combat emphasizes strategy rather than brute force, requiring players to manage limited resources and select appropriate weapons or healing methods at critical moments. The final confrontation with a powerful boss character represents a culmination of gameplay mechanics and narrative tension, encouraging players to apply accumulated knowledge and strategic skills. Throughout development, rigorous attention was given to code clarity, maintainability, and efficient resource management within the constraints of the Eclipse IDE, demonstrating the effective application of software engineering practices in game development. The project integrates suspenseful storytelling, challenging puzzles, and emergent gameplay to create an engaging experience that reflects not only technical skill but also creative design sensibility. By combining methodical programming practices with atmospheric game design, Null Vitals stands as a comprehensive academic exercise in developing a coherent, functional, integration of theoretical knowledge from software development, game design, and object-oriented programming disciplines.