The CEG HQ security room code is 4895. The hint is on the whiteboard in Maintenance.

Where it is

It's the security room near the front entrance on CEG HQ's ground floor (Part 4, Chapter 11: Inside CEG HQ). The ground floor map is behind the reception desk in the lobby.

What's inside

The Employee Database computer. Enter an employee ID there to print the access card that works the elevator.

Related puzzles