Tic-tac-toe is a classic game that has been around for centuries. It is a two-player game in which each player takes turns marking a 3x3 grid with either an X or an O. The goal of the game is to be the first player to get three of their marks in a row, either horizontally, vertically, or diagonally. The term 'tic-tac-toe line' refers to a line of three marks in a row, either horizontally, vertically, or diagonally. The crossword solutions for the term tic-tac-toe line are OXO (3 letters), OOO (3 letters), OOX (3 letters), XOO (3 letters), and XOX (3 letters). These five combinations are all possible ways to win the game of tic-tac-toe.