The first attempt at a non-linear map

What exactly is a non-linear map? Here, let me show you:

In Marathon's built in maps (By Bungie), you start on the first level and then go to the second level, third, fourth, etc, like so:

However, in Myriad, you can start on the 1st level, and depending on which path you take, you can go to the 4th, or maybe the 9th, or possibly the third, etc. like so:

This is just an example. Are you still confused? Then just play the map! You'll catch on soon enough!