Play the free two-player strategy game, Connect 4, where the objective is to form a line of four disks of the same color. Our online version of this popular game by Greatmathgame.com allows you to place colored disks on the files until you achieve four in the same row, vertically, horizontally or diagonally. As the screen fills up with disks, the game becomes increasingly challenging, so plan your next move carefully. Connect 4 is similar to the simpler version where you need to connect 3 to win. However, Connect 4 is more intricate and offers more possibilities to place your disk. Test your skills and see if you can master this legendary strategy game. Play against the ruthless CPU or challenge friends for a fun game day. Controls: Mouse.