Portal 2

Play Chapter 6 "The Fall" and reach the 1971-era test facility. Cave will begin talking about testing on hobos. Below one of the test spheres and a giant Aperture logo is a room marked "CONTROL ROOM" in yellow letters. Use a portal to get high above the Control Room and enter the small office. There is a cabinet with a door behind it in the corner of this office. Enter that door and follow the hidden hallway to a dock. At the end of the walkway near the docks is a orange life preserver marked "BOREALIS". Examine it to earn the achievement or trophy. Note: This is a reference to the Aperture ship "Borealis" that is seen at the end of Half Life 2: Episode 2.

• Test Chamber 1: Lift a box using the funnel. Note: Make sure you are on the lower section. Using its now gained height, throw it at Wheatley.
• Test Chamber 2: Same as Test Chamber 1.
• Test Chamber 3: Same as Test Chambers 1 and 2, but make sure you are in the first section of the chamber.
• Test Chamber 4: Pick up the turret behind the button and aim it at Wheatley. It will not shoot until released, setting it upright.
• Test Chamber 5: There are two monitors in this chamber. Both can be smashed by lifting a box in a funnel and throwing it, however the exit portals are in two different locations. The monitor first is on the wall in which the funnel is being projected on, around the center. This will require some experimentation to get. The second monitor is on the very right of the angled surface that you go through on your way to the exit.
• Test Chamber 6: Launch yourself on the Aerial Faith Plate.
• Test Chamber 11: Burn him with the Discouragement beam and the Redirection cube. You will need to use the box to get the beam on a Portal conductive surface, then use portals to get the beam to hit Wheatley.
• Test Chamber 12: When you are where you would normally use the cube to open the door, burn the monitor.
• Test Chamber 15: Do the same thing as Test Chambers 1, 2, and 3.
• Test Chamber 16: Note: This will require several attempts. Do the test normally. Save the game before the part where you coat turrets in Repulsion Gel. Only coat two of the turrets, leaving one alive. Save the game again. Using one of the portal surfaces on each side of the turret platform, jump on the platform while pressing [Crouch] to avoid bouncing on gel. Grab the remaining turret and use it to shoot Wheatley. Consider going behind the black strip of wall in front of the turret after you bounce the other two. Wait for him to begin shutting down then run out and grab him. By doing this, you can get him during the time required to close himself and re-open.

There is a turret inside a ventilation grate just past the elevator in Test Chamber 16. Jump over it, get the Refraction Cube, then use the laser to destroy that turret to open the grate. Enter the new area to find four turrets singing a song.
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