An interactive implementation of Ultimate Tic-Tac-Toe, an expanded, strategic variant of the classic game played on a nested 3x3 grid of standard boards. Built to explore strategic game theory and state-space mechanics, the application tracks complex board dependencies where each player's move dictates the specific sub-grid available to their opponent next. It features full game-state management, move validation, and dynamic win-condition checking across global and local board levels. 