When you fix the mirror and get to the exhibition center, there will be a door in the corridor with a lock that requires you to enter the correct graphic key. On the other side there is an open room. Follow there and pay attention to the board. This is the door code!
Hurry up to get working codes for free sets with lots of free parts, weapons, a new armored car and other prizes.
The studio has acknowledged several failures in the past.
The project is multiplayer and free.