Important thing to know :
1- You do NOT have to do the challenges for every door. That means you do NOT have to open the optional doors leading to area without any generator (also confirmed by oxBURN3Rxo ):
- The one between the left area (gaz station) leading to the parking area
- The one after on the right aera leading to the parking area
2-You have to do the 3 final challenge during the final cortex battle, they appear in a random order :
- Do not be hit by ancestor for 120 secs (4players). If the ancestor come from left or right door, go on the other side of the cortex building and camp. If the ancestor come from the front door ... you have to be skilled as it is a way harder to get reliable cover
- Kill the ancestor in less than 180 secs (4players) : shoot shoot and shoot, the disrupter and NX grenade do the work.
- Do 20000 damage to the ancestor (4p, 5000 for 2p)
3-Escape (survive until the cortex is overloaded and activate it)
Question : Can someone confirm if the challenges for opened doors are mandatory or optional ? Indeed you do NOT have to open every door but do you have to succeed the challenge for the opened doors or can you fail them ?