Things worth knowing
Zombies do not plan. They read a number off the floor and step onto a smaller one. Some run. One is very large.
Three factions: the late staff, infernal management and facilities automation. Each level has its own mix.
Crates hold ammo for what you own, plus some health.
Barrels explode. Explosions hurt everything nearby except whoever caused them.
Rare cases hide on every map. What is inside does not come back.