This Alien Rage - Unlimited walkthrough is divided into 13 total pages.
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Revelation

Make your way to the marker and kill aliens

Yes, that is another elevator

Clear the area

Lots of rocker ammo in the area, use it to destroy the mech, and yes you go in to an elevator after that

No you don't get to go outside

Shoot the explosive to get to the next area and finish the level
More Alien Rage - Unlimited Walkthroughs
This Alien Rage - Unlimited walkthrough is divided into 13 total pages.