The basic premise of xo game is simple: two players take turns marking
spaces in a 4x4 grid with their respective symbols (usually X for one
player and O for the other) with the goal of creating a row, column, or
diagonal of their symbols. The player who succeeds in placing four of
their symbols in a row, column, or diagonal wins the game. If all spaces
are filled without a winner, the game ends in a draw.