You have probably noticed there is an obviously placed Machine Spirit upgrade on the bottom floor behind a laser field.
But how do you access it, you might ask?
So How?
It can be done after surviving the first wave, search the room for servo skulls hidden in different locations, like in the picture, you can tell them apart by their bionic eye glowing red.
There should be 6 total, 4 on the statues around the middle of the map and two hidden on the ceiling.
After locating these, shoot them with your weapon, that is the reason why you alteast need to do the first wave.
If you found them all, your secret count should reach 4/4 and the lasers protecting the Machine Spirit will dissappear!
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