In Act 1, you see a massive bank vault door. It says "Requires Level 5 Access." Do not ignore it. Once you hit Level 5 (usually during Act 2, Mission 3), replay Act 1, Mission 2 from the main menu.
Walk through the hole to find a hidden rail control room. Inside, you will find the Railgun Sniper (one-hit kill until Act 4) and a console. Interact with the console (press E, Up, Down, Left, Right quickly). If done right, the screen flashes green, and a train will drive through the main tunnel outside, killing every zombie on screen instantly.
Immediately after the first tunnel collapse, you will see a broken maintenance ladder on the left wall. You cannot climb it directly. Instead, shoot the explosive red barrel behind the ladder. This doesn’t damage you but blows a hole in the wall texture.
This isn't just loot; it’s a "kill switch" for a massive wave. Using this secret makes the Act 2 boss trivial. 2. The Cryo Lab Ventilation Shaft (Act 3, Mission 1) Act 3 introduces the "Bloated Exploders." Fighting them in the open is suicide. This secret turns a death trap into a shooting gallery.
On the final mission, right before the final boss door (the huge skull gate), turn around. Walk back three screens to the cross corridor. There is a brick wall that looks identical to all others. Shoot the center brick with the explosive pistol (from the Bank Vault). It crumbles.
A Frostbite Shotgun (freezes enemies on hit) and a "Coolant Canister" (permanent +50 armor).
In the large laboratory with the spinning fans, ignore the green door marked "Exit." Instead, shoot the glass covering the pressure gauge on the wall. The gauge will spin, and a floor panel will lift.
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