The Gate to Thalassean
The Objective
Capture the Core Galactic Gate.
The Map
This map is mostly land, from the center left all the way to the right, with water on the left side and a well-defended island in the lower left. There you will find the gate. You start in the top center, and there is an extensive Core base stretching from the lower-center bottom to the lower-right.
The Strategy
Build enough structures to support a line of laser towers stretching from your starting point to the right. Space them about 6 inches apart and keep expanding in that direction until you hit the side of the map. As you move along you will find ore deposits to get metal. Keep building energy production facilities as you go along and the occasional radar tower. Build a Kbot lab and a Vehicle Plant when you can along the way.
Once you've built either a Kbot lab or a Vehicle plant, build a few construction vehicles to help you repair, build and reclaim metal. Start moving down the right side of the map, taking out Core patrols as you go. Make at least one Advanced Vehicle Plant in order to produce amphibious tanks. As you start producing the tanks and other advanced units, add them to your ranks and keep attacking down the right side. Once you've reached the bottom of the map, swing left -- this way you will finish off all the land units and be able to concentrate on taking the island and the gate.
Attack the island with about 6-10 amphibious tanks, and you should be able to capture it. Then, walk your Commander to the island and capture the gate.