Zombie Army 4 - Brutal/Nightmare | Zombie Zoo 4/4 | No Deaths/Revives

The beginning area was very tough. I could have played it safe and just sniped from near the saferoom, but I wanted to try it this way more.
The end area was easier than I was thinking it would be.
Almost died trying to be slow with all the Officers around when I could have killed them. I thought it was another Zombie Zoo 1 where they keep respawning.
My First Brutal/Nightmare playthrough! I had just recently gotten the season passes, and thought of now completing each level now that I have them all! I am not familiar with Nightmare Spawns, so I may be a bit slow in some areas.
No deaths or Self-Revives per chapter allowed for more fun!