Connect Four disc in a Line

This app is a popular game in which each player takes their turn by tapping a column on the board to drop a disc, beat your opponent to be the first person to get 4 of your discs in a straight row, either vertically, horizontally or diagonally. Features: 1 or 2 Player mode. Play against a friend or the computer. 3 difficulty levels- Easy, Medium and Hard. Undo function.