Added a re-imagining of Zombie Subway (2008) as a new playable area to Geisterstadt by entering the tunnels.
Moved Pack-A-Punch & Wunderfizz to the new playable area.
Replaced the starting pistol with the classic M1911. The M9 can be found within the Mystery Box.
Added world fog to the level. This is most noticeable with the power and flashlight turned off.
Made a wealth of balance changes across the board. This includes the Wunderwaffe DG-2.

Known Bugs:
- Zombies will rarely get stuck in a doorway in the basement.
- Skull-breaker boss will sometimes cause players using a controller to move unconditionally when snapping into ADS.
- Rarely, the Skull-breaker boss will have his projectile boulder get stuck into geometry after it is thrown.
- Rarely, a zombie will break its player tracking while super sprinting at the top of the staircase left of Pack-A-Punch.