Welcome aboard
If you want to solve the previous levels, we have left some hints behind, but feel free to ask for additional ones.

Nice! Welcome!

Level 18
https://notpron.com/notpron/finale/lamp.htm
How to get to Level 18

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Spoiler

Change the last part of URL to "lamp"

To be honest, I didn't even seriously attempt to solve this level. Music puzzles are not my thing.
So I'm gonna use the power of friendship and let others spoon feed me the answer 
But, I will share the clues that I found.

Changing the file name hints that this level is about music notes.
Changing it in another way will give you a few surprises

The music in the background plays 8 notes; the 3rd and 7th are the same. The 1st note is probably "d" if I interpret the filename clue correctly.

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... The 1st note is probably "d" if I interpret the filename clue correctly.

If you are referring to this file, there are also two clefs on the stave, so AFAIK D could be E.

Update: OK, you are right, it's D, otherwise the following letter sequence makes no sense. But why 8 notes? It's the same 4 letter word repeated twice.

/B')

I'm working through a couple of freeware games, but I'm putting on my NOTPRON thinking cap tomorrow.

 But why 8 notes? It's the same 4 letter word repeated twice.

Well, that's what the file looks like in audacity.

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I mean why is the same 4 letter word encoded twice?

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big spoiler


The second note is one note higher than the fist one, the third note is four notes lower than the second, the fourth note is two notes lower than the third.

Assume that the first note is D and you get the word.

Now the second note is one note higher than the fist, the third note is three notes higher than the second, the fourth note is five notes higher than the third.

Again assume that the first note is D and you get the same word.

Is this to confuse the players?

Maybe I've played too many easy freeware games the past weeks, losing all my notpron gains. At first I was completely lost. But I figured it out.

@Joe: The audacity of Joe!

@kamineko: No idea. If you use both words, you reach a page that tells you "once is enough, no?" I think the author was in a cheesy mood. The image alphabet game suddenly was.

 I think the author was in a cheesy mood. The image alphabet game suddenly was.

Since there are four of those images, I thought the letters of the "sizes" might spell the answer.

Sadly, none of them are A or F, though.

Level 19
https://notpron.com/notpron/finale/deaf.htm
How to get to Level 19

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Spoiler

Change the last part of URL to "deaf"

OK, once again we have a breather.
The puzzle is pretty straightforward, the clue is quite helpful.
Password hint, as usual, is not.

Other than that, the file name is weird. Is there some hidden stuff that I just missed?

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