MechAssault Walkthrough:
Thor on the Rocks

This level involves a ton of hiking around and shooting everything you can. In essence you go around blowing up 5 towers. You get diretionals to help you find where to go. When you hit the 'cave in' message back up, you can't go through forward without dying. Shoot all sorts of icy spots to find extra armor and new paths.

When you get to the end, Thor comes after you.

MechAssault Walkthrough, Tips and Techniques