I found a room with about 50 doors arranged in four rows of four on each side of the cube, but with some removed/blocked. Every door I have gone through has brought me to a different door in the same room, but the world map shows that there is an exit to another room. Which of the doors should I go through to get to the next room?
I've finished this puzzle - follow the instructions.
Find all four treasure maps that say rectangles. Every rectangle is a door.
Use the number artifact and go in every dark door - just make sure which side it is is right. Notice which side it is by noticing the treasure maps won't have doors everywhere, but, there are sides with the doors in the same place.
And just follow the treasure maps into four secret doors and by numbered order. But remember to go in the dark doors!
To learn the numbers, "visit what are the numbers in fez". Besides the first answer, it will show the list of numbers in fez.