Definition
Tic-tac-toe is the most common spelling of the simple game involving two players marking 'X's and 'O's on a 3x3 grid. Players alternate turns aiming to achieve three of their symbols in a row, either horizontally, vertically, or diagonally. Though easy to learn, tic-tac-toe embodies basic strategic thinking. It's a stepping stone to more complex games. Think of it as the gateway to chess or Go.