The paper deals with the development of a first-person shooter (FPS) game using Unity, one of the leading game development tools. It explores in detail all phases of game development, from initial conceptualization, through design and implementation of key mechanics, to testing and finalization. The goal is to provide a deep understanding of the game development process within the Unity environment, with a particular focus on challenges and solutions specific to the FPS genre. The basic elements that make up an FPS game are discussed, including world design, shooting mechanics, enemy AI, user interface, and performance optimization. The paper looks at the importance of the narrative and the atmosphere of the gaming experience. Throughout the development process, the different phases of design and programming, as well as the integration of various Unity tools, are documented. Despite the game's successful development, the paper identifies key project constraints, including time and resource constraints that affected the depth and polish of the final product. As a result, possible improvements and extensions are suggested, such as the development of more advanced AI systems, network capabilities, and improvements to visual elements, which could be explored in future iterations of the project.