We were in the second room and when we broke what we were supposed the key wasn't there (presumably fell through the floor).

@Puriti This can happen, sometimes, in CO-OP. I made some changes that should fix the problem. Thank you for the report!

In the room with the colored pyramids we (2man co-op) only had one red pyramid after solving all the puzzles. I randomly turned red from 1 to 2 and the door opened :D. Might be because the second red pyramid is behind the fallen tomb and you can miss it very easily.

Hey @xtrm! Thanks for the feedback, but there's not much I can do about that without changing the position of the pyramids and/or the code. Even then, not much would change.

As I said, I am not sure if we missed it or it in fact wasn't there, the door closed behind us after we went through so I couldn't check it.

@xtrm Ohh, I see. All of the pyramids are somewhere in the room. The one you missed was behind the opened sarcophagus on the floor.

I didnt realize I had the stone and used the pick axe to break the vases, and didnt get the key. Once I realized I had a stone, it was too late and I had to restart the room to go on. Otherwise, loved this room!

Hey brushstroke!

It shouldn't matter what item you use to break the vase. The stone is more of a suggestion.
The vase that contains the key is the one at the edge of the sand pile, next to the wall/pillar