: Look closely at the ventilation shafts along the subway walls. One grate is slightly crooked. Shoot it down and walk into the vent to find a permanent speed implant. Chapter 2: Mid-Game Hidden Caches (Missions 4–7)
Finding a single secret room can grant up to 10,000 extra credits, effectively acting like a built-in "cheatm" code. Stat Buffs: zombie shooter 2 secret locations high quality