Atredies:
1. There is a bug that makes the Sonic Tanks shoot further/shorter depending on game speed. Set speed to max to increase range.
2. Use a thopter to scout the enemy base.
Harkonen:
1. Brute force, nuff said :P
Ordos:
1. Scout with Raiders and thopters.
2. Use Deviators when fighting Harkonen to kill Devastators easily.
3. Build a Spaceport and import Rocket Tanks. You can't build them and at times they are cheaper from the guild than it would be building them anyhow.
General Strategy:
1. The enemy actually has unlimited spice. Stop them from taking spice off of the map so you can have large amounts for yourself.
2. Rocket turrents are the best defense
3. The enemy ALWAYS comes the same way, defend along this path.
4. Use the Spaceport to buy units at lower prices than building. It also allows you to exceed 50 units.
5. The infantry units are next useless. Troopers on a rock perhaps...but otherwise useless
6. Harvesters have heavy armor and can run down infantry...
7. Build your repair facility in the middle of your base. This causes units to be carried back to the front instead of being put out beside the building after repairs.