Developed the foundational Battleship core game framework for the d23-java/seabattle repository, delivering a complete, interactive console application in Java. Focused on object-oriented design, the work included implementing robust Player and Ship data structures, initializing modular display and processing components, and creating a starting screen to guide users. Incremental improvements refined ship placement, firing mechanics, and overall game flow, resulting in a fully playable experience. The codebase was structured for reliability and future extensibility, enabling quality assurance and supporting planned enhancements such as AI, multiplayer, and UI features. No major bugs were encountered, reflecting a focus on architectural soundness.