Everything you need to survive the desk: the full equipment locker, the complete personnel files on what's infesting the building, and a walkthrough of how the campaign actually works.
All 9 towers — cost, what they're strong against, and when they unlock.
All 28 enemy types, sorted by threat class, with full field notes.
Stages, cells, Rebirth, Gauntlets, Neon Nights — the whole campaign structure explained.