Line drawing games are a phenomenon that began on the iPhone with Flight Control, and became an overnight sensation.

The latest addition to the genre is Harbor Havoc 3D, which is primarily a line drawing game with three different levels of vehicle for you to guide into their destination.

Planes, boats and submarines all operate on different heights, essentially piling three games right on top of each other. It’s chaotic, but the kind of chaos that keeps you playing longer than the game probably deserves.