This guide shows how to find the Hidden Door Code in Case 1.1 of Gotham Knights to complete the objective “Find a Way to Open the Hidden Door”. You will have to investigate a crime scene, as part of that you must find the 3-digit keycode to a microwave that opens a secret door.
Case 1.1 – Investigate the Crime Scene
First, when you reach the crime scene, use your Augmented Reality ability by holding D-Pad Down 
. Check the right corner of the room, near the blood stains, there’s a mechanism under the door. You can see a cable attached to it going through the walls, follow it. This leads you to the lab table in the left corner, interact with it to start the keycode puzzle.
Case 1.1 – Find a Way to Open the Hidden Door
To get the keycode you must highlight the Sticky Note on the left and the Microwave on the right by pressing Square (PlayStation) / X (Xbox). Then you should see a line between them. Press Triangle (PlayStation) / Y (Xbox) to confirm the solution. This will turn the line green and displays checkmarks after each clue. The door code is 127. It will automatically input the code into the microwave after connecting the right clues. This opens the secret door on the right side of the room. You don’t need to scan all the other clues, they aren’t required.
Now you can go through the door, leading to a secret basement.
That’s all there is to solving the The Door Code (Keypad) Puzzle in Case 1.1 of Gotham Knights.
For all other Puzzles in chronological Story Order check out Gotham Knights All Puzzle Solutions.
Greg says
Cant get characters to bend getting through the archway at youtu.be/BYP-0Ldm9zo?t=4028
Tried different characters. It is an elevated platform into the cell block where there are guards. You have to bend or crouch to get onto it and I cannot get the characters to do so.
Thanks