Lines of Mania for the iPhone and iPod Touch
Lines of Mania looks like a simple game of connect-the-dots, but the more you play, the more you realize how important strategy becomes in the app. Essentially, you connect a series of points in numerical order, but if you simply go in a straight line from point A to B, you'll soon realize you won't be able to connect all the points.
You can take the strategy up a notch with the multi-player option, with points going to the person who completes the puzzle, as you take a series of turns.
Here's a look: