Could someone send me a written guide to day 3 of GK 20th anniversary? I am completely stuck, my score is at 119, supposedly I have done everything I needed and yet the day just won't end. O_o If I am looking at video guides, I can't see anything I haven't done either.

A Guide will not help.
I was stuck on Day 3 too. I think it is a bug and I assume it occured because Gabriel met Malia at the tomb before the butler told him that she is there.

I loaded a savegame and I talked to the butler before to meet Malia. It doesn't work.
Maybe we have to repeat the entire day and choose a sequence of actions to avoid the bug...

You are probably suffering from this: http://www.postudios.com/blog/forum/index.php?topic=14152.0

They also already sent the first patch to Steam, so it's only a matter of time until GOG will receive this as well: http://www.postudios.com/blog/forum/index.php?topic=14170.0

Maybe. My second try with a save at the beginning of Day 3 worked (fast clicking) anyway.

I suspected the Malia thing first as well, but that doesn't solve it. My next thought was that maybe I have to get the snake impression before copying the tomb symbols, but my friend did the impression last and didn't have any problems either. It would be really good to know what caused this, to avoid getting it a second time. I don't use the Continue feature, so that's not the problem.

In that case you should totally post about it over at postudios so they can identify and patch it!

Will do. In the end, I had to use one of their saves they put up in those forums. I glad I got through day 3 finally, but now I am 13 points short. -.-'