I designed and developed this 3D City Bus Simulator using Unity Engine and C#, taking full ownership of the project from initial concept through to final deployment. The simulator was developed to provide a realistic, immersive, and interactive urban bus driving experience for mobile platforms, where I managed every aspect of development, including bus driving mechanics, passenger pick-and-drop systems, interactive UI/UX design, detailed city environment creation, traffic and pedestrian systems, and performance optimization. I created highly realistic bus controls featuring smooth steering, responsive acceleration and braking, gear-based driving options, and precise physics to simulate authentic bus handling, making the driving experience engaging and true-to-life. A core feature of the game is the passenger management system, where players pick up and drop off passengers at designated bus stops, following structured routes and adhering to schedules, adding depth, strategy, and realism to gameplay. I designed a detailed and vibrant urban environment, including city roads, intersections, residential and commercial areas, traffic elements, street signs, and pedestrian characters, all enhanced with optimized lighting, shadows, and textures to create a visually appealing and immersive cityscape. The game also includes dynamic traffic systems and AI behaviors, simulating realistic urban congestion and interactions that challenge players to drive safely and strategically. I developed a clean, intuitive, and responsive UI system with interactive menus, route navigation, in-game dashboards, passenger indicators, and controls optimized for mobile touchscreens, ensuring smooth and engaging player interactions. Throughout development, I focused heavily on performance optimization, using efficient asset management, modular C# scripting, physics optimization, and lighting and texture balancing to maintain stable frame rates and smooth gameplay across a variety of mobile devices. This project demonstrates my expertise in Unity 3D game development, vehicle simulation, urban environment creation, passenger system mechanics, UI/UX design, traffic AI, and mobile optimization, showcasing my ability to deliver polished, immersive, and professional-grade simulation games that combine realistic driving mechanics, interactive gameplay, high-quality visuals, and stable mobile performance into a cohesive, market-ready product.