Remember that if you missed something, you could return to this mission at any time.
However, you must complete it for the collectibles to be saved.
This chapter describes only locations and ways of getting the collectibles.
Mission walkthroughs are in aseparate chapter of this guide!
Upgrading weapons
You will find a place to modify weapons immediately after reaching a new level.
As soon as you get to the place, you will immediately see the secret.

Sentry Battery
The battery is located in a narrow corridor.
To get to it, you must first destroy the cracked wall.
Then go to the end of the corridor and you will find the secret.

Doom Hunter Base
You will get to this place by completing the story task.
Automap Station.
Lost Soul doll
You will find the doll in a pipe suspended from the ceiling.

Just get to it, and you will be able to obtain a collectible.
It’s hard to miss this collectible because it’s burning like fire on the blue door.
Just climb the wall to the top.

Album - Keen - Shadows don’t Scare Commander Keen!!
To get to the album, you must enter the walls around the shaft and then jump inside.
This way you will get the collectible.
Crystal
On the balcony of one of the metal objects, you will find a crystal.
It stands out against the background of the environment.
There should be no opponents around.
There is a small corridor at the top of the building.
At the very end of it you will find a battery.
In one of the corridors, an additional element is attached to the ceiling.
In it, you will find the collectible.
You have to climb up the metal boxes and jump on them.
On one of the objects you will find a place with perks.
Doom Hunter
You will reach this note by completing the story mission.
This will open a hole in the stairs, under which you will find the secret.
As soon as you get to the place, you will immediately see the secret.
You will find second extra health in one of the metal objects.
All you have to do is jump to the other side and fall down.
This way, you will get the extra health.
On the spot, get up and collect your health.
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