Use this to find all the Dream Journal Pages make sure to beat the game after you get the pages to get the final achievement for 100%.
Before you get the 3rd gear make sure to go to the ceiling and follow the path to the right in this puzzle room.
After you put the "T" in the slot and activate the switch have the wall so you can go on the ceiling and follow the path.
After you put all the arms in place it's towards the end instead of ending the level going the normal way ( right) flip it so you're going to the left.
Solve the level when you are at the screen use the lever go back once and then follow the path to the left.
Solve the maze make sure the door is closed to the right and go to the ceiling and follow the path.
At the room where you find the guy looking around from time to time before you enter the room use the right wall to get to the ceiling and follow the path.
Hope that helps if you need anymore help just ask.... take care....