(VLR) What's the deal with the Locks, Lion Keys and other Passwords?

[HemborgerChariot]

So, I beat 999 and got all of the endings, but VLR has LOADS OF THEM! There are locks like 999 but they work differently and there's other roadblocks too. Essentially I want a spoiler free explanation on how they work. (You can give paths and stuff through CDs and AB Games, just no story details preferably.) Thanks!

[Jls]

It's the same principle as 999 : the key to unlock a lock is (generally) in another timeline. If you see a lock with a green background, it mean that it's unlock and you can continue the story; If it's in a black background, it mean that you don't have the information to proceed.
For the passwords : you'll get them in others timelines and the game will make it obvious that it's an important information. You have to write down the passwords (in the memo for example).

[HemborgerChariot]

Thanks, so the Lion ones are very obvious what the answer is when you find it?

[Jls]

Yes, don't worry.