The Code

The code is the code used in Through Abandoned: The Underground City. It is obtained by putting the light bulbs inside the light bulb containers. It is used to get inside the white room.

The code is:

Three fingers, Pointing finger, three middle fingers pointed inward with the other two pointed outward, and then X.

Trivia
If you enter the game knowing the code, you cannot enter it before inserting the light bulbs into the containers..