MCA Selector is a desktop application (JavaFX) for viewing, filtering, editing, exporting, and importing chunks from Minecraft Java Edition world saves (.mca files). It provides a tile map interface where users can select chunks based on various criteria (biome, block, entity, status, etc.), modify chunk data (change fields, replace blocks, edit NBT), export selections as images or .mca files, and import chunks from other worlds. The application supports a wide range of Minecraft versions (1.9 through 26) through version-specific implementations for chunk filtering, rendering, and color mapping. It includes both a full GUI mode and a CLI mode for batch operations. The architecture is modular, with separate packages for filtering, data modification, overlays, I/O, configuration, and UI components. It uses a job-based parallel processing system for efficient I/O and computation. The codebase is well-structured and demonstrates solid software engineering practices, though there is some duplication across version-specific implementations.