Mother of All Puzzles

[sklarjk]

Stuck on 41.

Spoiler:

I believe there is a .txt file I need to find, but that isn't helping me.

[jennworks]

Hi everyone!
I have been fighting with level 28 for a while. I got as far as wondering "amidone" and changed the filename extension based on what I saw, but no sound presents itself.
Please give me a hint! Anyone!
Thanks so very much...

[Carmeister]

In 26 I see that

Spoiler:

the image uses .gif instead of .jpg,

but can't do anything with it.

[Leibnach]

I'm completely stuck on level 30, giving up after two weeks of searching on this one... any help would be nice

Spoiler:

Found the hidden spaces, the 18 pictures, the fact that 4 and 16 are missing (tested things with squares and stuff), but cannot make anything from that...

Edit :
nevermind... found it...

Spoiler:

Find it randomly... I do not even understand why it's the answer...

[RedIvre]

It looks like people were working on this puzzle awhile ago but I'm just getting started and I am stuck on level 32. I've seen some hints online about it but I'm still not getting it - any body else have any suggestions?

[verdi]

Hey! Is someone still doing this puzzle?

Im really stuck at LEVEl 29.
I found the hints.. the opposite... use caps... but I cant figure the right solution

Maybe someone can help me...