Halite II is an open-source challenge framework that hosts turn-based strategy matches between user-written bots. Each turn, agents receive a map state, issue movement and attack commands, and compete to control the most territory. The platform includes a game server, map parser, and visualization tool. Developers can test locally, refine heuristics, optimize performance under time constraints, and submit to an online leaderboard. The system supports iterative bot improvements, multi-agent cooperation, and custom strategy research in a standardized environment.