During October 2024, Mrpao2595 developed five major gameplay features for the snakkze/1870-Hearts-of-Iron-IV-Mod repository, focusing on deepening historical accuracy and regional gameplay. He introduced a new South American Historical Alliance, expanded Brazil’s content with slavery-related mechanics, and refined Argentina’s initial military setup. For Paraguay, he rebalanced traits, added new ideas, and improved narrative localization. His technical approach centered on data-driven configuration using YAML and text-based scripting, leveraging skills in game development, modding, and localization pipelines. The work demonstrated thoughtful design and attention to historical detail, resulting in more balanced starting states and enhanced player engagement without reported bugs.