First off, thanks for the menu template! That saved me time so I could focus on the game.
The last room is a bit hidden. I'll give you progressive spoilers
Step 1
You need the flashlight to find the code
Step 2
Turn out the lights in the elevator and use the flashlight
Step 3
Go to the maze floor and keep the lights out. Use the flashlight on the walls and ceiling.
Hopefully that helps!