These Arnolds can also be defeated with a clipping shot, but will be quickly absorbed into the collective. Eggs will be dropped into the hideout, if left unattended, they will quickly hatch into Orbs. The best strategy to defeat an egg is to shoot them as quickly as they are dropped. Either a burst of fire from a machine gun or missiles will be sufficient to destroy eggs. If an egg hatches into an Orb, it will be a very tough enemy to defeat.
Orbs are fierce creations, highly armored and very mobile, armed with a rapid fire machine gun.
Heavy barrages of machine gun fire or a missile shot are what is needed to defeat an Orb. Again, stock up on missiles. Get as much equipment as you can. Also, the lamps above the rafters hold bonus items, so shoot as many of them as you can. Equipment is also stored in the shopping baskets that go rolling by.