Take turns to drop tokens into the frame and try to be the first to connect 4 in a line of your colour horizontally, vertically or diagonally.
See if you can beat the computer; it plays a mean game.
Can also be played against another player.
Full Help facility.
Open in Portrait orientation.
Versions for iPhone, iPod Touch, iPad, Nokia, Windows PCs and Macs also available from i.compactfun.com.