This guide will tell you how To open the Hidden Door in Gotham Knights’ 1st Investigation.
The first thing you will need to do is boot up your game and then start solving the hidden door mystery. After that, find a code that will be written on the sticky note. You have to make sure that the digits written on the sticker note should be the same as the digits written on the microwave. After verifying this, enter the code and the door will open.
