This mission is identical, mission tasks and objectives, to the original version of Metallic Archaea. The Extreme set of rules is pretty self-explanatory, as it basically means that enemies will deal more damage to you, meaning that direct combat is not something you want to do. You have full use of your tools and Buddies in these missions, except for the Chicken Hat and Reflex Mode.

The hardest part of this mission is taking the hits from the Skulls, who will do much more damage than on the regular version of this mission. In fact, the attack where they make a rock come out from the ground that explodes can possibly one-shot you, so you need to keep on your toes and make sure you look out for it.