Today must be the day where I discover all the games designed to make your brain pulse. Draw the Line! is kind of like that brain teaser where you have to connect points within a shape using lines that cannot intersect with each other. It goes one further by having you draw lines through each side of the shapes in each stage. To make matters more complicated, certain sides can only be entered in one direction, and other sides must be unlocked before a line can pass through them. The trailer will explain in more detail.
The chalkboard style looks like it melds well with the gameplay, as long as you don't imagine that you're solving these puzzles in front of everyone back in elementary school. Draw the Line! is free and is available now on the App Store.