The first 5 galaxy gates that you have to complete in order (by my opinion):
- First is the Alpha gate 34 parts (It will get you a long time to built it [because it is with beta and gamma gate and possibility for one part is 6%], but it's really easy and it gives really good rewards.)
- Second is the Zeta gate 111 parts (You need 120.000-170.000 uridium to built it. If you are a full elite, it will be for you a piece of cake and rewards are very important and you will won one havoc for one of your drones)