During a two-month period, Crossie enhanced the libgdx/libgdx repository by developing new API features focused on XML parsing and data structure utilities. They introduced getChildren() and replaceChild() methods to XmlReader.Element, enabling more flexible XML manipulation, and updated XmlReader to use a new replaceFirst method for managing child elements, improving parsing robustness. Crossie also expanded the Array class with replaceFirst and replaceAll utilities, aligning with existing patterns for greater API consistency. Their work, implemented in Java and leveraging core data structures and XML parsing techniques, demonstrated thoughtful API design and contributed to the maintainability and extensibility of the codebase.