Step 1. Open your folder and go to section 3. Buy the Plasma Laser then click "Go There".
Step 2. Walk to the yellow door. It will open, enter it.
Step 3. Walk across the vent to enter the next room. Then, continue to the next door.
Step 4. Walk to the computer solve the puzzle.
Congratulations! "Herbert Security Clearance 3" pin has been added to your inventory.
You've completed Chapter 3 of Operation: Blackout. The next missions will be available on:
Chapter 4 will be released on November 20.
Chapter 5 will be released on November 22.
Chapter 6 will be released on November 24.