- Next to the chamber number.
- Above the orange portal.
- On the right wall just before the chamberlock.
This chamber contains no doors, buttons or cubes, but is simply to test that you grasp the basics of how to use portals. The orange end of a portal is permanently in place on the middle pier of three; you're on the first, and the chamberlock is on the third.
To get to the middle pier, create a portal in a wall next to you, and walk through it; it will take you straight to the middle pier.
To get to the third pier, fire the portal gun at a wall on the third pier, and walk back through the permanent orange end of the portal. Although you just came through this portal from the first pier, since you've changed the location of the blue end of the portal, you now arrive on the third pier, and can exit the level. An important fact to remember is that when you fire the portal gun to create a portal end of a specific colour, the previously-existing portal end of that colour will disappear; you can only have one blue and one orange portal end at a time.
Well done. Remember the Aperture Science "bring your daughter to work" day is the perfect time to have her tested.
For an effective speedrun of this chamber, you need to move quickly and economically, but also realize that there is no need to walk out into the main area before you begin. As you leave the entry chamberlock, place your blue portal on the wall straight ahead but two panels to the left. Then move right up to it and you will trigger both portals to open. Experiment with exactly where you need to place the portal so that you pass the trigger point just as you walk into it. When you emerge from the orange portal, turn to the right and place the blue portal near the exit door. Don't waste any time turning around; move sideways back into the orange portal to emerge from the new blue one and then walk into the chamberlock. Practice this using different placements of the second blue portal, to the left, right or even above the exit, until you figure out which works best for you. Then practice again and again until you just flow through the level and you're ready for the speedrun. You should be in the exit chamberlock within nine seconds from when the entry chamberlock door opens.