This two-player game takes place on a 7x6 rectangular board. One player has 21 yellow men and the other has 21 red men. Each player can drop a man at the top of the board in one of the seven columns; the man falls down and fills the lower unoccupied square. A player cannot drop a man in a certain column if it's already full. The object of the game is to connect four men vertically, horizontally, or diagonally.