Four in a row

Instructions

Choose a friend or the computer, pick red or yellow, and decide who starts. Set the computer to Gentle, Clever, or Sneaky. Left and right arrows move across the seven columns. Home and End jump to the ends. Enter or Space drops in the aimed column. Keys 1 through 7 drop into that column. Click a column to drop there too. Each disc falls to the lowest open space. Line four of your color across, up and down, or on a diagonal. Stop the other color when they are one drop from four. A full grid with no line of four is a draw.