naughts and crosses

A repetitive, addictive, yet oddly pleasurable game for two.
A grid of nine boxes is drawn. The players pick their symbol (a naught or a cross), then take turns to fill a box with their individual symbol. The winner is the first to complete a line of three symbols - diagonally, horizontally, or vertically. The loser will then immediatly demand a rematch.
This game is often played on the back rows of classrooms and lecture threatres in schools and Universities across the world.