The Silver Case (PS4) - quiz skip in Spectrum
6After you've visited Koichi enough times in the third case Spectrum, there will eventually be a cutscene when you enter his room. Step inside and open System-menu simultaneously. On PS4 this input is forward + L1 + circle, all at the same time.
Skip dialogue for a while inside the menu. Eventually the scene switches to HQ. Save game as you hear music change and the text begins scrolling again.
After loading, you are able to move freely in the office. However, Naga's line about having to go to the lounge still appears on screen soon after. Unexpectedly, you can continue moving despite the line being visible.
Normally if you try to exit the HQ with this line still showing, you end up in a void and get stuck. But if you first exit HQ and then close Naga's line with a certain timing, your character ends up in lounge and then exits. Apparently the game's triggers are satisfied with this and it loads the Typhoon apartments again, allowing you to start level finale without the quiz that takes place in the lounge.
Maybe a 2-3 minute time save?