There is a progressive hint system in the massage and ventilation ducts. Each time you fail, the tooltip gives you a more advanced tip until you have the complete solution.
As I said, you don't need to win. After losing the first time, click "Try again". After losing the second time, click "Skip minigame (autowin)". Done. The game will consider you a winner. Unless you want to win the fight as a matter of honor, there's no need to stress about it. The autowin button is there so that everyone can advance in the story without necessarily having to win the fight.
The path was changed in the current version to make the code cleaner.
Yes, but not in only one playthrough since some routes block others. The game was designed for multiple playthroughs.
3 times. Days 18 - 21 - 32
Choose the disguise route at Willis corp and lose the fight in the elevator.
