Zombie Army 4 - Brutal/Nightmare | Hell Base 1/4 | No Deaths/Revives

Lots of screamers! Had to play cautiously with this long level.
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!