Castle Game Engine is an open-source 2D and 3D game engine using modern Pascal, with a visual editor and cross-platform support. It offers tools for scenes, cameras, and UI, integrating with Blender via glTF and X3D. Features include PBR, shadows, and physics, ideal for RPGs or simulations. It targets Windows, macOS, Linux, Android, iOS, Nintendo Switch, and WebAssembly. Its clean Pascal API ensures fast builds, appealing to developers seeking simplicity. The community provides documentation and demos, though Pascal’s niche status may limit adoption. Suitable for indie developers, Castle supports VR and continuous integration, making it versatile for modern game development.