i think its intentional,
!spoiler!
because if you solve the puzzle there will be a new door
Okay, but the thing is, I don't know what the piano's solution is, so I tried to go back to find the door with the clock, but then realized that I couldn't leave!
you don't need to go outside for it
answer is "where the time stops"
(in the pause menu)
Hey, thanks for the tip!
