Ratchet & Clank: Up Your Arsenal Tips

Easy wins at annihilation nation
Challenges that require 1 gun to win( like chop chop) you can use any gun in your arsenal to those kinds of weapons. First you stand out side of the big screen don't enter the challenge pick a gun any gun and enter that challenge you will enter that challenge with the weapon instead of the weapon you have to use. Keep on doing this until you run out of ammo or you change to the gun needed or you press triangle.