Connect 4 is a free two-player strategy game in which players have to form a line of four disks of one color. Play our online version of the popular connection game by Silvergames.com. Place colored disks on the files until you successfully set 4 in the same row. The row can be horizontal, vertical, or diagonal. It gets really tricky once the screen is filled with discs, so take your time and plan your next move wisely.