Does it happen in a certain route?
Let's just say it's not exclusive to any of them, though keep in mind you will have to see the bad endings to continue on with the game.
Also remember you're looking between the death itself and the Bad End screen. Anything before that is a wasted effort this time around.
Nooooot really... there might be some more secrets, but so far I've found a password that works on Day 4 (or the second time you can use the vault).
Edit: No amount of puppy eyes will make me reveal it.
I've only been able to find 9 passwords that work.
Yes, really! At least if we're talking about where you're guaranteed to get them, and ones required for progression. Other passwords... not so much, but they're optional.
