Prince of Persia

I think the room numbers can tell us something about how Mechner designed the levels.
For instance, what he saw as the core of each level and what were afterthoughts.
For some levels it's clearer than others.
I'll add all the levels with the room order marked in this thread below, one per post.

Demo level.

Level 1.

Level 2.

Level 3.

Level 4.

Level 5.

Level 6.

Level 7.

Level 8.

Level 9.

Level 10.

Level 11.

Level 12a.

Level 12b.