Objectives:
- Survive as long as possible
- Kill all the invisible zombies

Notes: there is a 357 in the other room,
the shotgun and crossbow are right at the start,
the respawning zombies go invisible after 1/10th of a sec, gives you just enough time to see them for a bit
best played with monster info OFF, that way its harder to tell where the zombies are
there is a satchel right outside, there is ammo for every gun in the room where up to 5 zombies that spawn from the same spot can be.