Untangle 1.5, a puzzle game, is free on www.frivplaygame.com. In order to get to the next level, you are supposed to untangle the lines on the screen first. Click at one point and hold to drag the lines. You must unfold these lines into one aspect without any cross point. Then, they will disappear and you will upgrade to the new levels. There are more free games on this website. Visit here to entertain yourself!