Let's keep it quick and easy.

You awake on a stone slab, your whole body aches and you don't remember a thing. As soon as you get up, you are approached by a floating skull.

;-)

OK, I've got two riddles today, time for someone else ;)

Planescape Torment.

Of course. :-)

Help, I'm trying to get to this guy's documents but his guardian won't let me pass because I'm not authorized to view them. I already made sure I look and sound like an authorized person, but now it seems I have to smell like one too.

Obviously, I know that one too but once again - maybe somebody else will guess it :)

No idea, feel free to say what it was! :D Though the situation reminds me of another game which isn't it, as you're not trying to get papers.

I'll clarify: you're not trying to get papers per se, because you don't know what it is exactly you're trying to get; you're just looking for clues.
What you find is "papers" + other items.

What's your game? Maybe it's the one.

And here is another hint: Ghorpm's answer is correct ;)

It's not because it's KQ6 - anyone who played it is sure to remember where you have to use your senses. ;)

I'll give it some more time ;)

Fallout?

I think ZFR won't mind if I give you an answer: no, it's not Fallout

The Book of Unwritten Tales 1 :)
Well, you deafen the plant, because it can hear you, then you need perfume to disguise your smell.
Or they made fun of copying it when you have to go by the guard plant in the archmage office.

Not this either. You don't just disguise your smell. You have to actually get the smell of an authorized person.