*The game is played on a 7x6 grid.

*Each player has 21 pieces, which are usually colored red and yellow.

*Players take turns dropping their pieces into the grid, starting from the top.

*The pieces fall straight down, occupying the lowest available space within the column.

*The game is over when one player gets four of their pieces in a row, horizontally, vertically, or diagonally.

*If the grid is filled up and neither player has four in a row, the game is a draw.