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P-Body's Quest Part 1

Lore:
P-Body receives a letter from an unknown employee telling him to arrive at Aperture Labs to help with an unnamed experiment, P-Body questioned to himself why they asked him but he had a feeling that he needed to urgently be there, he grabbed his portal gun and rushed over, upon arriving P-Body notices that the main entrance seems to be locked...

Walkthrough:
Hit the first button to open the door, walking forward and hit another button, this button opens a door behind you, go through and go down the tractor beam, going forward leads to a bounce gel dispenser and a gap partially blocked by glass, use portals to place bounce gel to get across, you'll end up on a platform with a cube-only button, go back to the tractor beam and get a cube hidden behind it, place the cube on the button (use cleansing gel if you accidentally get bounce gel on the cube), this opens a hidden path in the pit, go in the hidden path and push the button, go to the (now reversed) tractor beam and head back up, the door leading to the exit will now be open

(Optional) Hidden Weighted Sphere:
Go to where the first door was after hitting the hidden pathway button, a 2nd hidden pathway with the ball will be revealed