I could not figure out the Emperor Worm. The voice says at some time: Use the Engineers ... but how to get them through? If you attack Ordos at South right away, they are already guarded, and if you use a lot of time building up your base, you are attacked, and the Ordos base gets stronger... Well, I used some of the hints posted here, and solved it quickly (about 7 minutes normal speed) as follows: First start the base in the upper corner of the rock, add refinery (+upgrades), and a factory. Make a good portion of buzzsaws and some tanks to protect against the first attacks. Make a hangar, upgrade, and make two Advanced Carry-alls. Now save the game. Then take an empty Adv. Carryall and use it as a 'scout' and try to find a way without anti-air to the 'nose' of the Emperor Worm. For instance first South, then South East. If you lose the Adv. Carry-all, begin again from the saved point. When you have found a safe route, start from the saved point and take a Devastator along and drop it in front of the Emperor Worm's nose. There are no units to protect it at this moment. Get another Devastator with the other Carry-all. Bring it the same way to the Worm. Now with both Devastators launch an attack on the worm, and within a short time, it dies. Easy, but I don't understand how people can do it the 'slow' way ...