Defense Orbs is the weapon that we must have at first

[@maximiliando]

I remember I survived 13 minutes whitout defense orbs, I don't know how to beat bigcopters (dark green helicopters) and ballistic missiles (White missiles Who appears in the background) whitout flak cannon, the White choper doesn't bring me defense orbs

[@Huy036]

Dark Green Helicopter is an upgrade version of Grakin Helicopter , it fires faster and stronger
Ballistic Missile is only killed by shooting without Homing Missile , Rocket and Thunder strike
If you want to get defense Orbs first , you can pass the weapon from white chopper
After that , you can get the weapon that you want