I designed and developed OOPS, a physics-driven multiplayer co-op horror game in Unreal Engine, handling the project from gameplay prototyping through implementation. My work includes multiplayer and replication systems, physics-based object interaction, pickup/throw mechanics, weapons and tools, enemy AI, player death and revival systems, game-state logic, character interactions, level gameplay, debugging and optimization. The project focuses heavily on physical player interaction and cooperative mechanics, including carrying objects and teammates, recovering detached body parts, sharing tools and working together to progress through dangerous environments.