Portal 2

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"Walkthrough" Guide for Portal 2

| Portal 2 | 
---------- 
 
Written By: SwigGYx_X 
Email: swiggy12@gmail.com 
Version: 1.20
 
 
~~~~~~~~~~~~~~~~~ 
TABLE OF CONTENTS 
~~~~~~~~~~~~~~~~~ 
 
I. Introduction 
II. Version Info 
III. Walkthrough 
     
     Chapter 1: The Courtesy Call [C1] 
            
           Tutorial [0.0] 
           Test Chamber 00 [1.1] 
           Test Chamber 01 [1.2] 
           Test Chamber 02 [1.3] 
           Test Chamber 03 [1.4] 
           Test Chamber 04 [1.5] 
           Test Chamber 05 [1.6] 
           Test Chamber 06 [1.7] 
           Test Chamber 07 [1.8] 
 
     Chapter 2: The Cold Boot [C2] 
         
           Test Chamber 01 [2.1] 
           Test Chamber 02 [2.2] 
           Test Chamber 03 [2.3] 
           Test Chamber 04 [2.4] 
           Test Chamber 05 [2.5] 
           Test Chamber 06 [2.6] 
           Test Chamber 07 [2.7] 
           Test Chamber 08 [2.8] 
 
 
      Chapter 3: The Return [C3]
   
           Test Chamber 09 [3.1]
           Test Chamber 10 [3.2]
           Test Chamber 11 [3.3]
           Test Chamber 12 [3.4]
           Test Chamber 13 [3.5]
           Test Chamber 14 [3.6]
           Test Chamber 15 [3.7]
           Test Chamber 16 [3.8]
           Test Chamber 17 [3.9]

      Chapter 4: The Surprise [C4]
          
           Test Chamber 18 [4.1]
           Test Chamber 19 [4.2]
           Test Chamber 20 [4.3]
           Test Chamber 21 [4.4]
        

     MORE CHAPTERS COMING VERY SOON!!


[I. Introduction] 
 --------------- 
Hey guys! SwigGYx_x here. This will actually be my first guide I have ever 
written, so I hope you guys enjoy it. I have included links to videos that 
I have recorded throughout this guide if you need some visual aid.  
Contact me anytime via my email, and I will be happy to update my FAQ  
and answer anyones questions. Also, please ask permission before you put 
this guide on another site. 
 
Alright, let's get started!  
 
 
 
[II. Version Info] 
 ----------------
Version 1.30 (May 12th, 2011) -- Completed Chapter 4. 


Version 1.20 (May 9th, 2011) -- Completed Chapter 3. Added all video
links up to this point.


Version 1.10 (May 7th, 2011) -- Added video for chamber 6 in Chapter 
1. Added written guide for Chapter 2.  
 

 
[III. Walkthrough] 
 --------------- 
 
 
 
~~~~~ CHAPTER 1: The Courtesy Call [C1] ~~~~~ 
 
 
 
[0.0] - Tutorial 
(Video - http://www.youtube.com/watch?v=fsFDgu0VgfQ) 
---------------------- 
When you begin the game, you will wake up in what appears to be a hotel room.  
To ensure you are physically fit, a male voice will ask you to look up and  
down. Whew, what a workout! Next, go stare at the picture of the mountain  
on the wall when asked. When you have done all, go back to bed. Easy stuff.  
 
After you wake up, you will hear someone speak. Walk over to the door in your  
little  hallway and open it to find Wheatley, your new robot friend! The  
voice over the intercom will alarm you that it’s time to evacuate. Wheatley  
will then enter a hole in the ceiling, but rest assured, he will get you out  
of here!  
 
When Wheatley asks you to say yes, press A. You will jump. He then asks you  
to say apple. Press A again, and you jump again. Wheatley will then go back  
up to the roof and start moving the room around.  
 
Jump into the debris of your chamber. Wheatley will leave you shortly after  
this for the time being. Head forward and fall through the glass and into  
a room. This activates the male announcer’s voice. Let the tests begin!  
 
 
 
[1.1] - Test Chamber 00      
(Video - http://www.youtube.com/watch?v=fsFDgu0VgfQ) 
---------------------- 
Well, doesn't this look all too familiar! You should notice that this  
first chamber looks similar to the first room in Portal 1. There will be an  
orange portal that appears on the wall. Stepping through it will make  
you come out the blue portal outside of this glass chamber. Go through the  
first hallway. Stepping the big red button on the floor will release a  
cube. Go over, pick it up with X, and carry it back to the big red button  
and press X again to release the cube on top of it. The door will open.  
Go through it.  
 
 
 
[1.2] - Test Chamber 01      
(Video - http://www.youtube.com/watch?v=fsFDgu0VgfQ) 
---------------------- 
Dropping down into this chamber, you will notice there are three glass  
rooms. Pressing the red button in front of these rooms will open up blue  
portals. First, press the red button on the right, then head through the  
orange portal (located right behind you when you first drop into the  
chamber). Pick up the cube, then turn back.  
 
Go hit the red button on the left of the room, then go through the orange  
portal again. Drop the cube on top of the big red button. Head back.  
 
The door on the north end of the room is now open. Hit the red button  
in front of it, and go back in the orange portal. Continue through the door  
and onto your next test.  
 
 
 
[1.3] - Test Chamber 02      
(Video - http://www.youtube.com/watch?v=fsFDgu0VgfQ) 
---------------------- 
Going into this test, you will reunite with Wheatley. Hurray! Go towards  
the middle of the room where the portal gun is suppose to be. Instead, the  
floor will give way, making you fall down with it. Make your way to the  
room with crazy drawings on the walls. Go up the stairs and you will  
find your precious portal gun. Finally!  
 
Using your new toy, shoot a portal at the wall. It will make you come  
out of the orange portal up top. Climb up the stairs and simply walk  
through the various hallways. Eventually, you will drop down, and an  
orange portal will appear. Shoot a portal at the wall to come out the  
orange side.  
 
You will come to an area that seems like a dead end, but fear not! Simply  
shoot a portal near the door in which you are trying to get to, and  
go through the orange portal behind you. Go through the door and  
onto your next test.  
 
 
 
[1.4] - Test Chamber 03 
(Video - http://www.youtube.com/watch?v=fsFDgu0VgfQ) 
---------------------- 
This next room will have smooth jazz to sooth your soul. Neat! You  
will notice a cube falling down into a deep pit on the right side  
of the room. When it falls down, shoot a blue portal underneath  
it, making the cube come out of the orange portal on your level.  
Simply take the cube and put it on the big red button.  
Continue through the door to your next test.  
 
 
 
[1.5] - Test Chamber 04 
(Video - http://www.youtube.com/watch?v=fsFDgu0VgfQ) 
---------------------- 
When you enter this room, you will notice an orange portal appear up top.  
Shoot a blue portal at a nearby wall to get up there. Next, shoot a portal  
at the wall directly across from you (the platform with the cube).  
Turn around, go through the orange portal, and grab the cube on the  
other side. Drop down and put that cube on one of the big red buttons on  
the floor. 
 
On the north side of the room, there is a small pit with a cube in it. Shoot  
the floor underneath the cube to make it come out of the orange portal. Get  
back up there, grab the cube, and put it on the other big red button.  
Head through the door. You will be in a closed-off room, so just shoot  
a portal on the wall to get out. Head to the elevator.  
 
 
 
[1.6] - Test Chamber 05 
(Video - http://www.youtube.com/watch?v=fsFDgu0VgfQ) 
---------------------- 
Entering this room, shoot a blue portal on the floor to come out of the  
orange one. Now press the standing red button to dispense a cube on the  
north-east corner of the room (follow the blue dots on the wall to find it).  
Shoot a portal underneath the newly-dispensed cube to make it come out of the  
orange portal behind you. Pick it up and put it on the big red button.  
There are some stairs that will form after you do this, so go up them.  
 
Go towards the two standing red buttons. The left one will release another  
cube, and the right one will bring up the wall. What you must do is shoot  
a portal where the cube falls, sending it out of the orange one. However, a  
couple seconds after releasing the cube, go over and hit the button on the  
right. This will bring up a wall that keeps the cube from flying into the  
water. Go down and pick up the cube. Climb back up the stairs and place  
it on the big red button on the floor. Head through the door.  
 
 
 
[1.7] - Test Chamber 06 
(Video - http://www.youtube.com/watch?v=UlpTzRoEP00) 
---------------------- 
Shoot a portal on the wall to get into the next room. Now you will want to  
shoot a blue portal in the bottom of the pit in the middle of the room.  
Next, jump down into the portal. The momentum will send you flying onto  
the other side of the room. While on this platform, there is a small  
glass room with a hole in it below you (near the edge of the platform).  
Looking through the hole, shoot a portal underneath the cube in this  
small room. This will send the cube through the orange portal. Go back  
and pick up the cube.  
 
Shoot another blue portal in the pit, and then  
jump through it while still holding the cube. Put the cube on the big  
red button, and go through the door. When you enter the next room, look  
to the left. Shoot a portal on the slanted panel, and then jump down into  
the pit and through the orange portal. Next, grab the cube, shoot a portal  
on the opposite side of where you shot your first portal, and jump down into  
the orange portal again (while still holding the cube). Go put the cube on  
the big red button on that platform.  
 
Now, shoot a portal way up high on the same wall that you did last time.  
Jump through the orange portal, and walk through the door. 
 
 
 
[1.8] - Test Chamber 07 
(Video - http://www.youtube.com/watch?v=RhXI4o8T1UM)
----------------------
You'll meet back up with your witty robot friend, Wheatley. Hurray! Place  
a portal on the wall behind him and jump through the orange one. He'll  
detach himself from the rail, so pick him up with X and plug him into  
the socket that comes out of the wall. After he opens up a secret wall,  
Pick him back up, get on the catwalks, and follow them to the next area.  
You will eventually reach a broken-down GLaDOS. Go past the big metal  
circular object and you will find some stairs. Following that, you will  
reach the breaker room/cylinder. Plug Wheatley in when you get the  
chance. After he accidentally wakes up GLaDOS and you fall into the pit,  
move along the rails and wreckage until you come across the complete portal  
gun. Fire a portal on the wall ahead and then fire one on the wall next to  
you to continue on. The rest of this chapter just consists of firing portals  
to get past obstacles. End of Chapter 1!  
 
 
 
~~~~~ CHAPTER 2: The Cold Boot [C2] ~~~~~ 
 
 
 
[2.1] - Test Chamber 01 
(Video - http://www.youtube.com/watch?v=oPfdwgYi1xo)
---------------------- 
In this room, GLaDOS says she is going to trap you in a room with deadly  
lasers! Oh no! Well, luckily, there is only one laser. You will want to  
shoot a blue portal where the laser is hitting on the ground. Go stand  
on the lift near the door. Now, shoot an orange portal above the laser  
receiver (follow the illuminating dots on the left wall to find it).  
 
The lift will rise, and you can go ahead and continue unto your 
next chamber. 
 
 
 
[2.2] - Test Chamber 02 
(Video - http://www.youtube.com/watch?v=oPfdwgYi1xo)
---------------------- 
First, jump over the laser in this room. Find the small area in this 
chamber's corner that has a cube in it. Shoot a blue portal under the cube, 
and then shoot an orange portal on a nearby wall to grab it.  
 
Position this cube in front of the laser beam (while still holding it), and  
then try to deflect the laser into the receiver nearby (again, follow the  
glowing dots on the wall). Walk up the newly-formed stairs. 
 
You still need a cube to put on the red button. While still being on the  
second floor, shoot a portal underneath the cube you just used. Fire another 
portal on the floor, grab the cube and put it on the red button.

Continue through the door.  
 
 
 
 
[2.3] - Test Chamber 03 
(Video - http://www.youtube.com/watch?v=oPfdwgYi1xo)
---------------------- 
When you enter this room, get up to the platform with the cube on it (not  
the platform in the middle that raises) by using portals. Look up. See that 
laser receiver? Go ahead and shoot an orange portal on the floor  
directly below it. Grab the cube and jump to the middle platform. 
 
There are two laser receivers in this room--one on the wall, and one on the  
ceiling of the platform you just jumped from. Using the cube, deflect a 
laser into the receiver on the wall. Next, shoot a blue portal on the  
wall that the other laser is running into. Both lasers should now be hitting 
their receivers, allowing you to go to your next chamber.  
 
 
 
[2.4] - Test Chamber 04 
(Video - http://www.youtube.com/watch?v=ERuu6_uo7Nk)
---------------------- 
Look to the left when you enter this room. Place an orange portal on the  
middle part of the wall, and a blue one on the platform with the red button  
across from you. Hit the red button so a cube appears. Now shoot a blue  
portal on the wall that the laser is hitting into, making it come out of  
the orange portal and hitting the receiver. The platform will now start to  
move. Jump on it with the cube in hand, and ride it until you hit the other  
side. Place the cube on the big red button and carry on through the door. 
 
 
 
[2.5 - Test Chamber 05 
(Video - http://www.youtube.com/watch?v=ERuu6_uo7Nk)
---------------------- 
This is probably one of simplest (and enjoyable) challenges yet. The launch  
pads are bouncing a cube back and forth, so all you have to do is jump on one  
yourself and catch the cube. Try to launch yourself when the cube is near
its highest point. When you have grabbed it, put it on the big red button.  
Carry on to your next test. 
 
 
 
[2.6] - Test Chamber 06 
(Video - http://www.youtube.com/watch?v=ERuu6_uo7Nk)
---------------------- 
Jump on the launch pad in this room. You will bounce around a couple times,  
and then head towards a wall with two slanted panels. The idea here is to use  
momentum to shoot out one slanted panel and through the next, launching you  
to the other side. You have to try and act fast because you only have a  
limited amount of time. But if you screw up, no worries--just portal yourself  
to the start and try again. 
 
Once you are on the other side, hit the standing red button for a cube. After  
GLaDOS is done being a funny gal by sending you junk to use, she will send  
you a cube. Catch that when it is coming near you. Shoot a portal atop of the  
big red button nearby, and the other on a wall. Try to drop the cube through  
the portal and onto the big red button. Once you have accomplished that, head  
through the door. 
 
 
 
[2.7] - Test Chamber 07 
(Video - http://www.youtube.com/watch?v=ERuu6_uo7Nk)
---------------------- 
Grab the cube with the heart symbol on it. After GLaDOS dissolves it a few  
times (damn her trickery!), she will give you a proper one. Block the lasers  
path via the cube, and jump on the elevator. You will want to now move the  
cube to go up, so move the cube with portals.  
 
Now that you are up top, get the cube up there by using portals. Stand  
between the two slanted panels and look across the room. Grab the cube, turn  
left and shoot a portal on that panel. Using momentum, jump down through the  
other portal, sending you to the other side. Put the cube on the big red  
button. Move the portal on the panel to the panel beside it, and using the  
previous principles, use momentum to get to the other side. Go through the  
door. 
 
 
 
[2.8] - Test Chamber 08 
(Video - http://www.youtube.com/watch?v=lhoD3-OJTh0)
---------------------- 
When GLaDOS is done talking, head up the stairs and through the translucent  
wall. Hit the standing red button to call down a cube. It will dissolve if you  
try and bring it through the wall, so you will have to use your portal gun.  
Shoot a portal through the glass portion of the wall with a hole in it, and  
another behind you. Bring the cube through the portal.  
Using the cube, aim the laser to hit the receiver outside of the wall. Head  
through the door. Congratulations on completing Chapter 2!  



~~~~~ CHAPTER 3: The Return [C3] ~~~~~ 



[3.1] - Test Chamber 09 
(Video - http://www.youtube.com/watch?v=i6Xa56-5qOE)
---------------------- 
There is a story bit at the first of this room. When GLaDOS finally lowers
the ceiling, shoot a portal up there--one right above the launch pad, and 
the other slightly further north. Hop on the launch pad and jump through the
portals. There are three slanted panels in this room. Shoot a portal on 
the slanted panel furthest from the rooms exit. Go back to the launch pad.
Shoot the opposite portal above it. Using momentum, you should go flying 
up to the second floor. Press the red button, and a cube will drop directly 
across from you. Shoot a portal on the other nearby panel, and using the 
previous step, shoot across to the other side and grab the cube.

Using the cube, jump down and direct the laser beam towards the lone wall
that blocks the laser receiver. Shoot a portal on the slanted panel near
that wall, and go back to use the launch pad to go through it. Now that
you are up there, shoot two portals on the lone wall below--one on each 
side of it. The laser should go through the portals as if the wall wasn't
there, and hit the laser receiver. 



[3.2] - Test Chamber 10
(Video - http://www.youtube.com/watch?v=i6Xa56-5qOE)
---------------------- 
This will probably be the first test that will leave you scratching your 
head. When you first enter this room, look to the right--you will see a 
cube. How do you get over there? Momentum, of course! Turn around, and 
shoot a portal as high as you can above the entrance door. Go towards 
the platform with the cube. You will notice there is a skinny pit before
it, and this is where you will use your momentum. Shoot a portal down 
there, and jump through. You should now be on the platform with the cube.
Grab it, and go back to the entrance.

With the cube in hand, jump on the launch pad. You will hit a glass wall. 
Go towards the laser receiver and put your cube down infront of it. With 
the glass wall lowered, go jump on the launch pad again, which will now 
launch you unto a higher floor.

Hit the standing red button up here. It will shoot a cube up towards you. 
When it reaches you, grab it. Take it down a floor, swap it with the cube
in front of the receiver, and direct the laser beam to hit the portable 
wall in the distance. Grab the cube that isn't doing anything and hop on
the launch pad again. Now shoot a portal on the wall across from the laser
receiver. Pick the cube back up, jump down to the launch pad, and ride it
one last time. The glass walls shouldn't be up anymore, which will send
you to the highest floor. Place the cube on the big red button,
and head through the door. 




[3.3] - Test Chamber 11
(Video - http://www.youtube.com/watch?v=OqDfBAYAywQ)
---------------------- 
This is the first room that will make you utilize light bridges! First, 
shoot a portal on the wall the bridge is running into. Next, shoot the
opposite portal across the way near the exit. Once you are over there,
hit the standing red button. You can see through the glass that the 
poor cubes are just falling in the water! This will not stand!

Alright, so now you have to get over to where the cubes are dropping.
Walk back onto the bridge, and at about the half way mark turn right
and shoot a portal slightly lower than the height you are at. Now the
light bridge is running the opposite way. Turn around and walk in the
direction towards the falling cubes. Turn left, shoot a portal, and go 
forward. Turn right and shoot a portal on that wall--now the bridge 
should be running under where the cubes are dropping, allowing you to
grab one. With a cube in hand, head through the portal you just made,
making you come out near the entrance.

Shoot a portal on the same wall the bridge is running into, but higher
up. Grab your cube, and go through. Without going too far, turn left
and shoot on the portal close by while standing on your cube (you need
to keep your cube with you). Go half way on the bridge and look to the
left--see that glass room with the big red button? Yeah, you need to
get over there. Turn right and shoot a portal while standing on your
cube. Walk across the bridge with the cube and put it on the big red
button.

Alright, home stretch! Simply use portals to get to the exit door.
You can now head on through it. 



[3.4] - Test Chamber 12
(Video - http://www.youtube.com/watch?v=Lp07VEfHLoU)
---------------------- 
When you enter this room, shoot a portal above the light bridge up
and to the left. Then shoot the opposite portal on the nearby wall.
Now that you are on the bridge, shoot one portal on the wall the 
bridge is running into to, and the other in the distance to the right.
Go through the portal, which should bring you to the start. Hit the
standing red button, and make sure your bridge is under the location
where the cube is falling. Grab one. 

Now you need to get to the other side! Get back up to where the
original light bridge is again. Go to the source of the light bridge,
and look down. Place another portal on the vertical part of the 
standing red button platform. Ride it to the other side, which should
lead you to the exit. Place your cube on the big red button. 



[3.5] - Test Chamber 13
(Video - http://www.youtube.com/watch?v=fQhT1KRSq1s)
---------------------- 
In this chamber, you will be introduced to those pesky turrets. To 
destroy these buggers, simply pick them up and throw them down with X.
Get rid of the first one this way. Don't run around this first corner 
or you will be pelted with bullets. Instead, shoot a portal behind the
turret around the corner, and another on a nearby wall. This allows 
you to get behind him without harming yourself. Destroy it. There is
another corner after this. Shoot a portal underneath the turret, and
another one on the wall. This should destroy the turret. Continue ahead 
and up the stairs. 

To get rid of the two turrets in the glass room, you need to shoot a 
portal on the ceiling, but behind the turret. Repeat this step again 
for the other one. Now they both should be down.

In the next room, there should be three turrets. Using the previous step,
shoot a portal on the ceiling to drop down behind them. If you are fast 
enough, you can just run to all three and destroy them without getting
hurt. Simply go back and pick up a cube near the glass room, and bring 
it near the exit door. Place it on the big red button.



[3.6] - Test Chamber 14
(Video - http://www.youtube.com/watch?v=YpHmOrOEGPI)
---------------------- 
Once you get lifted up to the next platform, the tests will begin. Pick 
up the cube in this room and take it to the right side of the room 
(while still being lined up with the laser beam). Line up the two
receivers on the left and direct the laser beam through both of them.
Now there is just one left!

Shoot a portal on the wall that the laser is now running into. Now
shoot the opposite portal on the right wall. The laser coming out
of the portal must hit the remaining receiver. Once you have done
that, you are granted access to the next chamber. 



[3.7] - Test Chamber 15
(Video - http://www.youtube.com/watch?v=C62vFmpXShI)
---------------------- 
You will again have to utilize light bridges in this chamber. Shoot a
portal on the wall where the light bridge is running into. Creep around 
the corner slowly and put the opposite portal on the wall in front of the
turret, granting you a barrier. Get as close to the turret as possible, 
shoot a portal off to get rid of the barrier and run to destroy the turret.
Continue on to the wide-open room.

To walk around this room without getting lit up, you will have to use the 
light bridge as a barrier wherever you go. While protecting yourself this 
way, head towards the exit. You will see two launch pads. They will just 
send you back and forth unless you have a light bridge in the middle of 
them, so create one above the exit door. You need to run across the glass
bridge, but they will pelt you if you don't protect yourself. Shoot a light 
bridge going across the lower part of the room. Now run across the glass 
bridge and fall down. Quickly take out the four turrets there. Grab the 
cube and put it on the big red button in the middle of the room.

Just one small part left! To destroy the two remaining turrets, simply use 
the strategy that I introduced in the first part of this room. Head through 
the door. 



[3.8] - Test Chamber 16
(Video - http://www.youtube.com/watch?v=xkjsyR2eY6o)
---------------------- 
Get into the middle of this room and stand on the big red button. See that 
laser beam shooting down towards the floor? Shoot a portal underneath that. 
Then, shoot a portal on the wall that faces those damn turrets. The laser 
should come out of the portal, destroying the turrets. Go ahead some, grab a 
cube (not the reflecting one, the standard cube), and bring it back to the
big red button. Set it on top of it. 

Go back and put up the reflecting cube. Point it towards the turrets past the
glass wall, destroy them, and then point it towards the receiver over there.
Now you can head towards the exit and through the door. 



[3.9] - Test Chamber 17
(Video - http://www.youtube.com/watch?v=O9t8wA_U_L0_)
---------------------- 
Yay, more light bridges! Shoot a portal on the wall that the light bridge is
running into, and another on a nearby wall to get up there. Before you grab the
cube, shoot a portal on the opposite wall of where your light bridge portal is. 
Grab the cube and head through the portal to the other side. You should be close
to the laser receiver this time. Place the cube near the front of the receiver, 
blocking the beam. It should also be directly over the big red button. Head 
towards the elevator.

While standing on the elevator, get rid of the bridge going across the big red 
button. The cube will fall, which should land on top of the big red button and 
lifting the elevator in the process. Congratulations, you just completed 
Chapter 3! 



~~~~~ CHAPTER 4: The Surprise [C4] ~~~~~ 



[4.1] - Test Chamber 18
(Video - http://www.youtube.com/watch?v=IanUwyNjVic)
---------------------- 
This room is a bit unusal. Not only is it very open, but there is a lot of 
things going on. First, Shoot a portal on the other side of the room while
using the vertical light bridge for cover. Go through the portal.

You should see a standing red button to your left. If you press it, you'll 
notice that the two cubes just bounce into each other and then fall into the 
water. Using the light bridge, make a barrier between them near the far launch
pad. If you get do it right, both cubes should be on the far away launch pad.
Return to the start of the room using portals.

BE CAREFUL! If you haven't noticed yet, there is a turret in this room that 
will rip you to shreds. You may need to use cover by constantly using the 
light bridge as a barrier (shoot one portal above the light bridge, and the
other portal wherever you are on the floor). Go grab a cube, and carefully 
move to the south-west area of the room. See the laser shooting down?
Direct the laser into the two receivers that are lined up perfectly. Go back
and grab the other cube. Using the cube, direct the laser in the middle 
of the room to the turret, destroying the thing once and for all! Then, 
simply shoot the laser through the two remaining receivers. 



[4.2] - Test Chamber 19
(Video - http://www.youtube.com/watch?v=zxeQ9ErGNMU)
---------------------- 
This chamber is hard if you don't know what you are doing. First, grab the 
cube in the middle of the room and bring it to the right side of the room. 
Look up and shoot a portal to the upper platform. Get up there using portals,
while bringing the cube with you. Direct the laser to the receiver across from
you. Go back to the middle of the room. Look up where you dropped down near the
first. Then, look slightly left of that--you will see a small portable tile 
on the ceiling. Portal your way up there and grab the cube when you fall down.
Bring it up to the entrance door. 

Next, you need to get the third cube. Shoot a portal above the launch pad in
the middle of the room and hop on there using another portal. While you are
going up and down on this launch pad, look around the room--see the cube up
high near the entrace? You will need to use momentum to get there. Shoot 
your other portal on the big portable wall on the side of the room. Once you
get to this final cube, bring it back to the entrance door like you did with 
the second one. 

Now we need to get to the location where the first receiver we saw was. Using
momentum and portals on the wall, shoot a cube over there first. Then, Go
over there yourself and direct the laser towards the receiver near the 
entrance door. Go back up near the entrance door. Now use the final remaining
cube to direct the laser towards the turrets across from you, and then towards
the final receiver near the exit door. A bridge will form. Use momentum and 
portals on walls to get over there. Go through the door. 



[4.3] - Test Chamber 20
(Video - http://www.youtube.com/watch?v=9Z8Z2pkcbX0)
---------------------- 
Explore this room for a minute. You will find three laser receivers near the 
exit door. Put a portal on the lone wall in front of them. Now look at the 
wall on the right of the entrance door. Place the other portal on that wall
where the laser is running into. Now one of the lasers should already be 
hitting a receiver. 

You will notice that there are two cubes in this room. Take one of them and
direct the one of the other laser beams into the nearby portal. Position it 
so you can see that you are hitting a receiver. Repeat that step again, and
you should be hitting all three receivers!



[4.4] - Test Chamber 21
(Video - http://www.youtube.com/watch?v=qY_dDT-lOoM)
---------------------- 
Shoot a portal on the wall the light bridge is running into, and another on
the wall right by the standing red button in the distance (use zoom if you
need to find it). Press the button and a cube will fall behind you. Go grab
it...well, try to. The power will go out, and your friend Wheatley will 
return once more. After your chat, start running!

Wheatley will encourage you to keep running, and I suggest you do just that.
Continue running through the linear path until you get to the room with 
turrets. Find your way around these little guys and destroy them. Near the
turret that was furthest away is a low wall that you can see over. There
is a wall outside that you can shoot to portal yourself out of there.
The rest of the chamber will simply consist of more running until you get
to the elevator. 


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