By dealing with these challenges you will be rewarded by the game.
Mission challenges are not available in the first or second level of the campaign.
They only appear from mission 3 -Cultist Base.
you’re free to find them in the Challenges -> Mission tab.
Each time you complete a mission challenge, a message will appear on the screen.
Completion of all 3 challenges available in a particular mission will grant you aSentinel Battery.
you might place Sentinel Batteries in the slots available in the Fortress of Doom.
This will unlock new rooms in the hub location.
In the originally inaccessible areas of the Fortress you may find some various types of collectibles.
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