Here is how you beat the "Impossible Challenge"
easily first,have at least 60 pieces of life in your life bar,next,be sure to have gotten the
Plasma Storm,Killonoids,Megarocket Cannon,
RYNOII,Megaturret Glove,Omniwrench12000,
Meteor Gun,Heany Lancer,Blitz Cannon,and finnaly the Zodiac.Here are some tips that will help:
1.Stock up on all of your ammo.
2.Use your wrench if you are close to an enemy.
3.You should at least have Durasteel Armour.
4.Blitz Cannon for light close range.
5.Heavy Bouncer for heavy close range damage.
6.Heavy Lancer for long range light damage.
7.Megarocket Cannon for heavy long range.
8.RYNOII and Zodiac will be weapons that are used when you need help with destruction
9.Killonoids and Megaturrets are are used as support and cover fire needs.
10.Only use this if you will have fun!!!!!

(P.S. I acquired all weapons and needed power ups before I beat this.The Zodiac should be used if you need to destroy some powerfull enemys.If you cant beat it after my guide tells you what you do go to Planet Yeedil and train.)