And then I needed an efficient Pathfinding System which was able to handle hundreds of instances easily whilst allowing effective, complex cost based pathfinding.

After countless minutes of my precious time wasted on the internet I finally found exaclty what I was looking for in the gpathfinding.dll developed by Paul Weijtens.

What I also found however was that this dll was too hard to incorporate into GM with modifying and packing it into an extension.

So after a full night of using a poorly coded Extension Maker(aptly named Extension Maker shown below) to package it.