Lava Highground - Highest Difficulty! - Part 6 - 400 resources vs 60 000 - 1 vs 3

Part 6.
This was very challenging, and could only be done by having enough energy to D-Gun the starting units. Took two attempts to beat this. Also this map made it possible to block off the small entryway. As I could slowly build up Metal and Energy. Later on in the game, I did not realize a Big Bertha at the very top edge of the map, was taking out part of my base. This is a longer game than usual due to the extra challenge.
Game: Total Annihilation(1997) by CaveDog.