Apparently you can't hear that auditory cue in the mobile version which makes this challenge much harder. Bidybab was a major problem in the mobile version because in the pc version you have to listen to thumping sounds that bidybab makes in the vents, I thought to myself, 'Eh that's not a big deal', but then I realized that you can't hear thumping sounds that bidybab makes in the vent, which basically is the signal to let you know that bidybab is about to enter your office and jumpscare you. I've seen Markiplier beat this challenge and I keep watching his videos to see how he beats it. I've seen people beat this challenge on PC version but I haven't seen people beat it on mobile version. I have beaten all the custom night challenges in the game, but it's this one challenge that I believe is impossible which is Golden Freddy mode. I have every star in the fnaf games, including Sister Location.