Play "Four In A Line" online with players all over the world or play with machine AI with 7 difficulty levels. "Four in a Line" is a two-player game in which the players first choose a color and then take turns dropping their colored discs from the top into vertically-suspended grid. The pieces fall straight down, occupying the next available space within the column. The object of the game is to connect four of one's own discs of the same color next to each other vertically, horizontally, or diagonally before one's opponent can do so. There are two variations on the board size, the most commonly used being 7x6, the other being 9x7.