• This is a detailed walkthrough on how to beat Portal. The game has been released on the Xbox 360, the PS3, and the PC, but it is identical on all platforms with regards to everything but the controls. The entire standard mode of the game is covered, and there are links to additional walkthroughs located towards the bottom of the page.

1. You begin by awaking and hearing a computerized voice instructing you on what you'll be doing at Aperture Science Laboratories.
2. One the voice is finished, a portal will appear in the room, go through it and into the next area.
3. Walk around the large cube-shaped room you once occupied and through the circular door into the next room.
4. Once inside, step on the large red button on the floor. A door across from you will immediately open, but once you step off of the button it will close.
5. You must pick up the box, then place the box onto the red button. The circular door will now remain open, allowing you to proceed into the next room. Once inside, enter the elevator.

• YouTube: Portal Opening Scene/Test Chamber 00 (Time 2:21)

1. Once you exit the elevator, walk forward and view the large white sign.

1. Now take a left and fall downward into the lower part of the test chamber.
2. As soon as you fall, an orange portal will immediately appear behind you and the computerized voice will tell basically tell you that you must place the box onto the red button.
3. The orange portal will repeated flash between three areas: one containing the box, one containing the red button, and another containing the exit door.
4. First, go through the portal and into the room containing the box, then pick up the box.
5. Once you pick up the box, exit through the blue portal when it appears.
6. Now turn around and wait for the orange portal to open up into the room with the red button; once it does, enter and place the box onto the button.
7. Once the box is placed on the button, exit through the blue portal when it appears and wait for the orange portal to cycle back to the room containing the exit.
8. Once the portal leads to said room, step inside and proceed to go through the circular exit door and into the next elevator.

• YouTube: Portal - Testchamber 01 (Time 1:05)

1. Walk forward and then turn right, go straight and down the stairs then take a left.
2. Wait for the blue portal to appear to your right. Once it appears, go through it. #You are now in an elevated area of the level, with the closed exit door to your right.
3. Walk forward and fall down to the lower area of the level.
4. Go up to the portal gun and grab it. Now shoot a portal onto the wall and go through it. You are now back where the exit door is located.
5. Before going through the exit door and into the elevator, let's take out some cameras.
6. First, shoot down the wall camera directly in front of you. Then turn slightly to the left and shoot a portal in the opening.
7. Now turn around and go back through the orange portal behind you. You should now be back towards the beginning of the level.
8. Go to the very beginning and there will be a camera just above the first opening. Now go down the stairs again and detach the camera in that area (it's straight across the the stairs when you go down).
9. Okay that's all of the cameras, so shoot a blue portal, go in, take a right, and then go into the exit elevator.

• Tip: Destroy any wall cameras you see so you can later get the Camera Shy Achievement.

• YouTube: Portal - Testchamber 02 (Time 0:46)

• Cameras: (3/33)

1. Walk out of the elevator and turn left. Shoot down the wall camera and then walk forward.
2. Turn right and then shoot a portal onto the wall; go through the portal you shot.
3. A camera can be seen when you turn left and look up. Shoot down the camera.
4. Now shoot a portal beside the exit door. Go back through the orange portal and you'll wind up right next to the exit.
5. Before leaving, shoot down the wall camera near the door. Go through the exit door and into the elevator.

• Cameras: (6/33)

1. As soon as you exit the elevator, go ahead and shoot down the next wall camera. #Step on the red button and then step off, releasing the box. Go around the clear screen.
2. Before falling down to where the cube is, shoot down the wall camera in front of you.
3. Once you fall down into the hole with the cube, shoot a portal.
4. Pick up the cube and head out the portal you just shot.
5. Drop the box onto the red button and proceed to the exit.

• YouTube: Portal - Testchamber 04 (Time 0:29)
• Cameras: (8/33)

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1. Head out and turn right. Shoot down the wall camera before going into through the opening.
2. Once through the opening, turn left and shoot down yet another camera.
3. Now shoot a portal onto the wall and go through it.
4. Once on the plateau, shoot a portal beside the box on the platform directly in front of you.
5. Turn around and go back through the orange portal and onto the other platform. Grab the box and drop it onto one of the red buttons.
6. Now drop down into the pit across from the closed exit door. Shoot a portal, pick up the box, and go through the portal you just shot.
7. Now fall off the platform and place the cube on the other red button. Once through the door, it will close.
8. Shoot a portal on the wall on go through it. Shoot down the camera in this small room and then proceed to the exit elevator.

• YouTube: Portal - Testchamber 05 (Time 1:02)
• Cameras: (11/33)

1. Proceed out of the elevator and into the larger room.

• Tip: Avoid the flying orange balls at all costs. Coming in contact with them results in instant death.

1. Shoot a portal directly above the white structure on the ground with the red light coming out of it. Once the ball goes through, the platform across from you will go down.
2. Step on the platform to make it move up, then proceed to the exit elevator.

• YouTube: Portal - Testchamber 06 (Time 0:18)
• Cameras: (11/33)

1. Exit the elevator and go forward. Shoot a portal onto the blackened area of the wall where the orange death ball keeps hitting.
2. Once the ball goes into the receiver and activates the moving platform, shoot a portal above where the platform begins on the left.
3. Now stand in front of the orange portal on the floor and wait until the platform appears.
4. Once you see the platform, fall into the orange portal.
5. Wait for the platform to move to the far side, then jump onto the metallic-looking floor and go into the exit elevator.

• YouTube: Portal - Testchamber 07 (Time 0:53)
• Cameras: (11/33)

1. Once you begin, the AI will inform you to stay out of the green water. Coming in contact with it will instantly kill you.
2. This part is a bit tricky, first you must shoot a portal at the black spot on the straight across the area you stand on when you enter the main room.
3. Once the orange ball goes through the blue portal, you must then shoot another portal across from the orange portal.
4. Once you have the ball going in an infinite loop, shoot yet another blue portal across of the receiver with the red light, causing the orange ball to go into the receiver and activate the moving platform.
5. Now that the platform is activated, shoot a portal at the wall to your left, and go through it.
6. You will now be on the platform with the orange portal. Shoot a blue portal to the area where the moving platform stops, then go back through the orange portal and onto the moving platform.
7. Once the platform reaches the other side, jump over to the walkway and go into the exit elevator.

• YouTube: Portal - Testchamber 08 (Time 0:43)
• Cameras: (11/33)

1. As soon as you enter, the AI tells you this testchamber is impossible. This is not true, it's actually pretty simple.
2. First, shoot out a blue portal beside the box, then pick up the box and walk through the portal and onto the elevated plateau.
3. Now shoot another blue portal into the room with the red button.
4. Pick up box, turn around, and walk back through the orange portal.
5. Now place the box onto the red button and go proceed to the exit elevator.

• YouTube: Portal - Walkthrough Test Chamber: 9 (Time 0:28)
• Cameras: (11/33)

1. Walk forward into the room and shoot down the next wall camera first, then shoot a portal onto the ground. Jump into the portal to be propelled to the upper area.
2. Now go up the steps and into the next room. Walk forward to the edge of the precipice and shoot a portal down into the hole. Jump down to be propelled across the gap and to the next area.
3. Once in the next area, shoot a blue portal into the area behind you where a chunk of wall should be sticking out. Now fall into the orange portal at the bottom of the pit.
4. Once on the next level, turn around and shoot another blue portal onto the chunk of wall that has came out the farthest. Again, fall into the orange portal in the pit.
5. There's the exit elevator. Go on in.

• YouTube: Portal Chapter 4 Testchamber (Time 4:54)

• Cameras: (12/33)

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1. As soon as you exit the elevator and go into the first room of the stage, turn completely around and look up. Say "cheese" for the camera, and then blast it down. #Now shoot a portal onto the wall and wait until the gun in the center of the room you are looking into blasts an orange portal that will allow you to step on solid ground and not into that murky, green water.
2. Press the red button. Shoot a blue portal into the elevated room whose door just opened up temporarily. Once the center gun shoots an orange portal beside you, head into the room with the orange ball of death.
3. This part can be a bit tricky, but the best way to do it is this: shoot a portal onto the wall next to you so you can see where the center gun is shooting.
4. Once you see the receiver with the red light through your portal, immediately shoot a blue portal on the blackened part of the wall where the ball is ricocheting off of. This should cause the ball to go through your portal and into the receiver. #Now the platform by the center island will begin to move, so all you have to do is shoot a blue portal and wait until the center gun shoots an orange portal that will take you onto the moving platform.
5. Once you get to the center island, pick up the next part of your portal gun.

• Achievement: Lab Rat

1. Now press the red button that appears. Shoot a blue portal into the elevated room where the exit is, then shoot and orange portal on the other side of the moving platform.
2. Stand on the platform, wait for it to reach your orange portal, then go through it and into the exit elevator.

• YouTube: Portal - Testchamber 11 (Time 3:06)
• Cameras: (13/33)

1. Enter the main room and turn right and look up. Shoot a blue portal onto the chunk of wall that is sticking out.
2. Now walk forward a bit and shoot an orange portal into the pit, then jump into your orange portal.
3. Once you get up to the higher level, shoot another blue portal onto the other chunk of wall that sticks out higher and further.
4. Now fall back down into your orange portal.
5. Looks like you need a box now, and you'll notice one dropping on the other side of the stage.
6. A piece of wall on your side will come out and tilt. Shoot a blue portal onto that piece of wall, then jump back down into your orange portal.
7. Now grab the box, and jump over to where the red button is situated.
8. Place the box on the button, and then jump back down into your orange portal to get back to the other side. Now go into the exit elevator.

• YouTube: Portal - Testchamber 12 (Time 1:19)
• Cameras: (13/33)

1. After you exit the elevator and go into the first little room, turn around, look up, and blast down another wall camera.
2. Now shoot a blue portal up beside the box, then shoot an orange portal onto the wall beside you.
3. Go through the orange portal, grab the box, and place it onto the red button.
4. Now go back through your orange portal, then go through the door you just opened.
5. Once you fall into the larger area, turn around and look up beside the door you just came in; there's a camera. Shoot it.
6. Now shoot a blue portal above the floor receiver emitting the red light, then shoot an orange portal onto the blackened part of the wall where the orange ball is bouncing around.
7. Once the ball goes into the receiver, shoot a blue portal on the ceiling above the moving platform.
8. Then, shoot an orange portal onto the ground in front of you.
9. Once you see the elevator in the orange portal, fall onto it. Grab the box and throw it onto the ground.
10. Now shoot a blue portal directly above the tallest plateau, then grab the box and drop it in your orange portal and onto the button.
11. Next, shoot a blue portal above the shorter plateau. Then fall onto the other red button using your orange portal.
12. Now that the door is open, shoot a blue portal into the room that the door opens into.
13. Shoot an orange portal onto the wall and walk through it to enter the exit room. #Once inside, shoot the camera down, and head into the exit elevator.

• YouTube: Portal - Testchamber 13 (Time 2:10)
• Cameras: (16/33)

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1. As soon as you enter the main room, take a left. Some stairs will appear in front of you; climb up them.
2. When you're at the elevated location, the stairs will go away. Walk right beside the metallic wall near the box, turn around, and look up. Shoot a blue portal onto the wall directly across from the box, but near the receiver.
3. Now shoot an orange portal into the pit where the stairs once were, and fall into it. You will now be propelled beside the box.
4. Pick up the box, and head back down the stairs once they reappear. Place the box onto the red button.
5. Before you head through the door you just opened, shoot a blue portal above the receiver with the red light.
6. Now go through the door you opened and into the room with the poison water.
7. Wait for the moving platforms to move up, then jump across and into the room with the orange ball.
8. Shoot an orange portal onto the blackened part of the wall. The ball will now go into the receiver and activate the moving platform back in the main room.
9. Go up the moving platform and through the exit elevator.

• YouTube: Portal Testchamber 14 (Time 2:09)
• Cameras: (16/33)

1. After you pass the white sign, look up and shoot down the camera.

• Achievement: Terminal Velocity

1. To go ahead and get this achievement, simply shoot one of your portals on the ceiling directly above the other on the floor.
2. Fall into the ground portal and keep falling into it until you get the achievement.
3. First, shoot a blue portal onto the piece of wall that is sticking out directly behind you when you walk into the main room.
4. Now shoot an orange portal onto the ground directly in front of the blue portal. #Jump into the orange portal, but as you fall shoot another orange portal and fall into it. This will build up your momentum, propelling you across the wall that is blocking your way.
5. Once on the other side of the wall, shoot down the next wall camera.
6. Head through the hallway and into the next room. Shoot down yet another wall camera.
7. This next part is tricky. First, you must shoot a blue portal onto the blackened part of the wall where the ball is bouncing. Immediately afterwards, shoot an orange portal onto the wall across from the area where the receiver is located.

• Tip: Do not go through the fuzzy electric field or your portals will disappear.

1. Once you have the ball bouncing into the area with the receiver, head through the electric field and shoot a blue portal on the blackened part where the ball just bounced and an orange portal directly above the receiver.
2. Once the ball goes in, the moving platform will be activated. Go on into the third area.
3. When you first walk in, turn around, look up, and shoot a blue portal onto the piece of wall sticking out.
4. To your right, go into the opening and into the little side-room.
5. Once inside, shoot down the wall camera on the left side, then shoot an orange portal onto the white ground and jump into it.
6. As you fall, shoot another orange portal onto the ground and fall into it, this will, again, build up your momentum, propelling you over the wall blocking your progress.
7. Now that you're on the other side, shoot a blue portal onto the piece of wall sticking out above the receiver.
8. Now stand on the wall below the receiver and shoot out an orange portal. Fall into the orange portal, and then as you fall out of the blue one, shoot another orange portal to propel you over the wall.
9. Alright, this part is VERY tricky. First shoot a blue portal onto the wall to the left of the left diagonal piece that is sticking out.
10. Then shoot an orange portal onto the wall to the right of the right diagonal piece that's sticking out. If done correctly, this should send the ball into the receiver. You may have to try a different method, because sometimes it will randomly go in if you try different things.
11. Now use the wall-propulsion method we've done many other times on this stage to get back to the other side of the wall.
12. Once there, look into the hallway with the moving platforms & poison.
13. Shoot a blue portal onto the far wall.
14. Then, shoot an orange portal onto the wall beside you. Wait until the platform appears, then jump onto it.
15. Once on the platform, immediately shoot another blue portal onto the wall to your left (in the direction the arrows are pointing towards).
16. Wait for your moving platform to take you back to your orange wall, then go through it when you see the moving portal.
17. Once on the portal, turn to the right and shoot another blue portal into the next room.
18. Wait until you get back to your orange portal, then enter into the next main room.
19. Once you're inside the next room, shoot down the wall camera just above the entrance to the room.
20. In this next sequence, you must be very quick. Go up the elevating platform to the left of the room entrance first. Once up there, shoot a blue portal into the room diagonal to the one you currently occupy. Then shoot an orange portal onto the wall beside the red button in the room you occupy.
21. As soon as you press the button in your room, go into your orange portal and press the red button in the other room.
22. Once both buttons are pressed, you must be fast. Shoot an orange portal on the piece of wall sticking out above the entrance, then shoot a blue portal onto the blackened ground where the ball is bouncing.
23. If done correctly, the platform leading to the exit elevator will begin to move up and down. Get on it and go into the exit elevator.

• YouTube: Portal - Testchamber 15 (Time 3:21)
• Cameras: (21/33)

1. As you walk in, the AI will tell you some info about the level being a live firing course, so beware. When the door opens, go in and shoot down a wall camera.
2. When you turn left you will see a turret, if you simply knock it down it will turn off, so just bump into it.
3. Once it's out of the way, go down the small metallic hallway, but before entering the room with the red light, shoot down the next wall camera.
4. Once the wall camera is detached, lean into the room and shoot an orange portal into the door way. Be careful not to get too close to the red light.
5. Now go back to the first room and shoot a blue portal. Pick up the deactivated turret and go through your blue portal.
6. Now drop your turret for a second, lean over and quickly shoot a blue portal behind the enemy turret. Now pick up your deactivated turret again and bump it into the active one to knock it down.

• Achievement: Friendly Fire

1. Now proceed into the longer hallway. In the middle there is a turret, quickly look into the area where the turret is and shoot down the wall camera behind it.
2. Now shoot a blue portal at the end of the hallway and make an orange one to go through to avoid the turret in the middle.
3. As you continue, you find yourself in a room with 2 boxes, and there is a hallway with two turrets. For the record, it takes a LOT of gunfire to kill you, so don't be too concerned about getting shot a bit.
4. Okay, first shoot an orange portal above the turret closest to you, through the clear screen. There should be an "X" telling you where to shoot your portal.
5. Now shoot a blue portal on the ground and drop a box through it. If done correctly, this should take out the first turret.
6. Now shoot an orange portal above the turret on the other side of the hallway. Again, there will be an "X" above the turret if you need help.
7. Now drop the other box down the blue portal, taking out the second turret.
8. Peek into the next room and quickly shoot an orange portal behind the two turrets. #Once back to safety, jump into your blue portal to get behind both of the turrets. #Bump into each of them to knock them down. Shoot down the wall camera that is on the wall behind where the turrets once stood.
9. Now peek into the next room and shoot an orange portal above the turret in the corner (the one facing you).
10. Once back to safety in the larger room, shoot a blue portal, and then drop a box into it.
11. Now that the corner turret is gone, you may go into the small room and simply knock down the turret closest to you, just watch out for the turret behind the screen.
12. Now grab the box and charge at the remaining turret, using the box as a shield as you approach the turret.
13. Now that it's down, just lay a box onto the red button, opening the door. Before you enter the door, be sure to shoot down the wall camera that was above the last turret.

1. When the door opens, watch out for the turret! Shoot an orange portal above it, then get to safety and drop a box into a blue portal.
2. Once the turret is out of the way, blast down the wall camera in that little area. #Go into the far corner of the room and look through the metal grill.
3. Shoot a blue portal next to the turret, just out of it's sight on the wall. Then make an orange portal, go in, and knock the turret down.

• YouTube: Portal - Testchamber 16 (Time 3:17)
• Cameras: (26/33)

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1. Once you walk in you will see a camera on the metallic wall. Remember that you can only destroy cameras that are on normal walls, so don't waste your time trying to detach any cameras on metallic walls.
2. The AI will then give you a companion cube to help you out. Use the cube to climb the metallic steps.
3. Once at the top, hold the cube level in front of you and walk towards the machine that is shooting out the orange balls. The cube should ricochet any dangerous balls away from you. Be sure to time it right when you enter the long hallway.
4. Once you get into the little area with the two ball-shooters, you must pick up your companion cube and walk backwards up the next long, metallic hallway. Be sure to time it right and hold the cube level with the orange ball of death, otherwise, you're a goner.
5. At the end of the metallic hallway, there is a wall camera you can actually destroy, so proceed to do so.
6. Once you go into the larger room, there will be another camera. Destroy it too. #Now fall down into the lower area of the room, but take your cube with you.
7. Grab your cube and head into the metallic room under the camera you just destroyed.
8. Use your cube to ricochet the orange ball into the receiver.
9. Now one platform will rise up, two to go.
10. Use your portals to go back up to the area where you came from. Shoot an orange portal onto the wall where the orange ball keeps ricocheting. Then turn around, jump down, and shoot a blue portal onto the slanted area across from the receiver. #This will cause the ball to come out, ricochet off the ceiling, and go into the receiver. That leaves one more platform to move.
11. Now you have to go all the way back to the room containing the two ball shooters, except this time only the first will still be on.
12. Once it releases a ball, follow the ball up the stairs and shoot a blue portal on the wall where the ball is going to hit.
13. Now that that portal is placed, go back down to the lower area of the large room. #Head into the large metallic room where the red button is. Carry your companion cube to the back of the room and place it on the elevated red button.
14. Next, shoot an orange portal on the area of the wall that is protruding out in the larger, white room. Timing is crucial here. Once the orange ball goes flying by you, quickly step on the red button to open the door, allowing the ball to proceed through the two open doors and into the final receiver. Now the last platform is up.
15. Alright, now shoot a blue portal above the first platform, then shoot an orange portal onto the ground. Before entering, grab your companion cube and take it with you.
16. Fall onto the first platform via the orange portal.
17. With companion cube in hand, leap from platform to platform. When you get to the room with the red button, place your companion cube onto it. The AI will tell you to kill your companion cube.
18. Regardless of how close the two of you have grown, you must kill the cube to continue.
19. Go into the door the companion cube is holding open and press the button to open the incinerator. Now go grab the cube and drop it into the hot, boiling lava.
20. Now turn around and enter the exit elevator.

• Achievement: Fratricide
• YouTube: Portal - Testchamber 17 (Time 5:09)
• Cameras: (28/33)

1. Head forward out of the elevator and shoot a blue portal on the ceiling on the other side of the gap. Now shoot an orange portal below you and jump into it.
2. Once on the other area, don't worry about going into the alcove in the wall; there's nothing in there. Instead, look to the ceiling of the next area and shoot a blue portal up there.
3. Now shoot an orange portal onto the wall in front of you. Make sure that when you look into the orange portal you don't see poison below, because if you do, you'll jump right into it and die.
4. When you have the two portals how you like them, jump into the orange one, but be careful not to fall into the poison that's below the wall. It's best to put your orange portal kind of low so you can hold forward and fall into with ease.
5. Now, onward to the third plateau. Again, aim your blue portal onto the ceiling above the plateau and then use your orange one to fall over there.
6. Once there, shoot a blue portal onto the wall relatively close to the wall camera you cannot destroy. Then use a grounded orange portal to fall over there.
7. To get to the next area, you have to shoot a blue portal onto the piece of wall that protrudes out above the closed door. Now shoot an orange portal onto the plateau below the one you're on.
8. Fall into the orange portal to be propelled to the next area.
9. This next part is one of the hardest areas of the entire game, so be cautious. #First press the red button, causing the wall to come out and allow you into the next room. Once in, immediately head left to avoid getting shot up.
10. Now you must use the flying orange balls to blow down the turrets so you'll actually have some room to move around.
11. First put a blue portal onto the wall where the gun's laser is pointed, then shoot an orange portal onto the blackened wall and wait for an orange ball to take out the turret.
12. Use this method to go ahead and get rid of all of the turrets. Once all 4 turrets go toppling into the poisonous depths, take out the wall camera near where you entered the room.
13. This next part is extremely difficult to most, but there is an easy way to do this.
14. Okay, set up a blue portal as high as possible up beside the elevated button. Now set up an orange portal you can jump through. Your goal here is to get on the podium with the button.
15. Once you're up there with the button, press it and jump into the little cubicle with the ball receptor.
16. Now the AI will allow the door to stay open as long as you occupy it.
17. So shoot a blue portal onto the blackened part of the wall and an orange portal onto the right panel that is jutting out in front of you. If you do this right, the platform in the middle of the stage will begin moving.
18. Now get on the moving platform, go to the area on the other side of the deadly poison.
19. You must jump onto the lower area where the podium with the button is located. #This next part is tricky, so get your timing right. First shoot a blue portal onto the wall near the area where you came in.
20. Then shoot an orange portal onto the wall of the room you're in now. Press the button and quickly run through the orange portal.
21. Now when the panel turns diagonal, shoot an orange portal onto it, turn and fall into a blue portal that you shoot on the way down to the lower ground.
22. Be careful not to fall into the poison! This should propel you to where the box is located.
23. Grab the box and jump onto the moving platform. Carry the box back to the other side and place it near where you know the exit is going to appear.
24. Head back across the pond and use the same method as before to get back.
25. Grab the box and head back; place it on the grounded red button when you get there. Once the door is open, shoot your portals and head on over.
26. This next part can be pretty fun, but also irritating at the same time. You'll have to use your propulsion methods to "bounce" from platform to platform. Before beginning, take out the wall camera.
27. First set a blue portal on the first platform. Then turn around and look to your right; there's gigantic pit.
28. Shoot an orange portal down, and propel yourself way into the air, quickly shoot an orange portal onto the second platform. Be sure to tilt back slightly so that you'll fall back into your blue portal and propel yourself upwards when you get to the second platform.
29. Once in the air above the second platform, shoot a blue portal. Continue this until you reach the fourth platform, where you'll then have to shoot your next portal onto the left wall to propel yourself to the fifth platform.
30. You must remember to alternate the portal color to keep your momentum up. This is much easier said than done, but you'll get the gist of it as you try many, many times. One on the fifth platform, go through the exit elevator.

• YouTube: Portal - Testchamber 18 (Time 8:10)
• Cameras: (30/33)

• Here we are, the last testchamber. It's quite long, so be prepared.

1. Go down the hallway, take a right, once in the room, turn right and shoot down the wall camera.
2. Now shoot an orange portal onto the diagonal floor panel on the left, just below the ball-shooter.
3. Then shoot a blue portal onto the diagonal panel on the right, just below the receiver.
4. Once the ball goes through the orange portal and out the other side, quickly shoot another blue portal randomly onto the wall. Now the ball will ricochet off the panel and into the receiver. The moving platform is now activated.
5. This next bit is annoying, so be cautious. For the first obstacle, just crouch. Once past the safety island, wait a bit, then jump into the little area on the left where a podium button is located.
6. Take out the wall camera in this area. Once the moving platform nears the closed door (but not too near!), hit the button, jump on the platform, shoot a blue portal onto the opposing wall, and then jump back into the safety area with the red button.
7. Now shoot an orange portal onto the wall and wait until the moving platform comes back, then jump on.
8. For this next part, just shoot a blue portal onto the wall where the ball is bouncing away, then shoot an orange one way out of your proximity.
9. Once the ball is out of the way, shoot down the wall camera in the corner.

• Achievement: Camera Shy

1. As you approach the random wall jutting out, shoot a blue portal to the left of it and slightly forward, and an orange portal onto the jutting wall itself.
2. When you approach your orange portal, slide back as you go, and then when you see the moving platform coming out on the other side, jump!
3. Now the moving portal will take a turn and there will be fire. Ahh! The AI wants to kill you. To avoid certain death, shoot an orange portal onto the wall straight in front of you, and then shoot a blue portal onto the wall beside you and slightly downwards. Jump into the blue portal if you want to stay alive!

• Achievement: Partygoer

1. Alrighty, now the AI wants you to just chill, but you gotta get out of there. If you look back the way you came in and up, you'll see an elevated area. That's where you want to be. Shoot a blue portal as high as you can on the wall opposite to your desired location, then shoot an orange one onto the ground. Fall into the orange and then shoot another orange as you are falling down. When you fall in, you'll propel yourself to the other side.
2. Once on the other side, go down the hallway, turn right, go up the stairs--or not. #Okay, so just use your portals to get up the stairs, no big deal. Once up there, open the door and head inside.
3. Go up the stairs in this room and you'll arrive at a locked door.
4. Shoot a blue portal into the area past the locked door and then shoot an orange one onto the wall to get in. Open the next door and go in.
5. Once there, use your portals to get past the fans (right or left, it doesn't matter).
6. Shoot a portal to the wall in front of you, then shoot another portal beside you to get across the poison pond.
7. Once over there, shoot a blue portal above the left fan room, and then an orange one onto the wall beside you. Jump just right to land on the walkway in the center of the room. Proceed on into the next room.
8. Go down some stairs. Thanks to the clue on the wall, we know where to go next. Shoot a portal into the elevated area where the red wall clue is roughly pointing. #Once up there, shoot the blue portal just to the left of the other broken walkway across from where you are. Then shoot an orange portal, jump down into it, and propel yourself onto said broken walkway.
9. Go forward, up some stairs, up some more stairs, and then jump into the broken tube.
10. Ride the tube for a little while until you get to a hole, jump down into the room. Look familiar? Go through the "fizz" and into the room.
11. Stand on the button, shoot a blue portal into the hallway in front of you, then shoot an orange portal onto the wall next to you.
12. Proceed down the hallway, then fall down the elevator hole.
13. Once down there, there's another padlocked door. Shoot a portal to the ceiling left of the door, and then shoot your other portal into the elevator hole; fall into the next area (you may have to crouch here too).
14. Hop onto the second moving cylinder and quickly shoot a blue portal onto the ground in the direction you just came from.
15. Head back a bit, go to the area in which you must crouch, then shoot an orange portal up. You can now stand again.
16. Proceed to jump on the giant, moving cylinder and go to the next area.
17. Follow the red clue down the hallway, shoot a blue portal through the grating, then head back and shoot an orange portal into the first area you find available. Go into the orange portal to the next area.
18. Looking stuck? Well just look up, turn a little, and shoot an orange portal in the upper corner. Now use your blue portal to fall into the elevated cubicle.
19. Go into the dark-red area, and then down the hallway and into the room with 5 moving cylinders.
20. Go up the center cylinder and shoot a blue portal into the hallway you'll see towards the very top of the room. Shoot an orange portal onto the wall and go in to get to the upper hallway.
21. Head down the hallway and into the room with 2 cylinders this time.
22. Turn left from the entrance and look up; shoot a blue portal onto the ceiling you see.
23. Now shoot an orange portal on the ceiling above one of the cylinders. Jump on that cylinder and go into your orange portal; you'll now fall onto the path of 2 horizontal cylinders.
24. If you are about to be squished, jump down and try again.
25. If you end up on top of a cylinder, proceed onto the safety area.
26. Look above the red clue and shoot an orange portal up there on the wall near the fall. Then use a blue portal to transport up there.
27. See that horizontal cylinder smashing against the wall? Shoot an orange portal directly above where it's hitting the wall, then shoot a blue portal beside you and fall onto the cylinder.
28. Once you're riding the cylinder, the red clue tells you where to go next. You're going to have to put a blue portal on the wall opposite where the clue is pointing, then put an orange portal down below you. If done correctly, you can fall into the orange portal and propel yourself to the next area.
29. Once up there, portal yourself onto the other side of those rapidly-moving cylinders.
30. Now you'll see two vertical cylinders in front of you. When they both go down, shoot a portal straight and then use your other portal to get past 'em.
31. Once in the next room, look up. Intimidating? Well it's really not too bad. Just alternate your portals above the cylinders to climb them, once you get high enough, you'll be above to the floor of the next area, and better yet, you can shoot a portal onto it.
32. Now use you other portal to get over there. Go past the red exit clue, fall down onto the pipe, wall, then fall onto the pipe below.
33. When you get to the cylinder, shoot a blue portal above it.
34. Now go back a little and shoot an orange portal onto the wall. Jump into the orange portal at the right time to fall onto the cylinder.
35. Ride the cylinder and continue to the next area. The red arrow tells you to go down. So fall down the shaft. Once down keep going until you end up on some cylinders. They'll move, then you'll fall.
36. There are now 3 closed doors. Each of these doors contains a gun, so as soon as one opens, pick up a barrel for a shield and knock each of the guns down.
37. Continue this until all three guns are deactivated. In the final chamber, there is a claw, place a barrel to the left of the claw.
38. Now jump onto the barrel and shoot a blue portal up into the next room. Use an orange portal to then fall into said room.
39. Shoot a blue portal onto the top of the broken ladder. Then shoot an orange portal onto the wall beside you. As soon as you enter the orange portal, take a hard right to slide over onto the upper area.
40. Go around and through the shaft beside the clue. When you fall down, knock over the turret.
41. Fall into the next room, turn completely around, and shoot a blue portal onto the tilted portion of the wall. Now shoot an orange portal onto the ground and fall into it. The limited space is hard to work with, but keep looping to pick up momentum until you reach the other side of the broken walkway.
42. Once in the office-y looking area, turn left and press the button. This robot will shoot missiles at you, but you can easily avoid them.
43. Once it breaks the glass, head into the room with it. Don't try to kill it; you can't. Just make it shoot the glass on the other side so you can keep going. Once it does, keep going. Go down the hallway, turn left and open a door. Enter this room.
44. Once in here, there's more glass. Put a portal across from the glass, go back, then make the robot shoot a missile through your other portal to break the glass. #Now there's a cube transport tube...made out of glass. So shoot one portal below the tube and then make the robot blast a hole into the tube with a rocket.
45. Grab the cube when it falls out, then use it to climb up to the next shaft.
46. Once in the shaft, you'll see a fan. Shoot a blue portal below the fan and onto the wall. Go back through the shaft and use an orange portal to get back to the area mentioned above. You're now in the poison sewer.
47. Use portal to get from the metal island to the next area.
48. Once there, use the clue arrow and look up. Use your portals to get up there. Now you're in a sewage tunnel.
49. Use portals to get out. Now a LOT of guns will appear in all directions. Big deal, just use your portals to get behind the turrets and knock 'em down, one by one. #When all the guns are down, you'll now need to fall down to the center of the room.
50. Look up slightly, towards the middle of the room and you'll see a titled wall coming out of one of the chambers. Pop a blue portal up there, then put an orange on on the ground in front of it.
51. Use the loop method to build up some speed until you see the top of a similar tilted wall, shoot a portal up there.
52. Use the loop method again to gain access to the next area, which is quite high I might add.
53. If you run down the hall quickly, you can get behind the turrets before they are even ready to shoot you, then knock 'em down.
54. Now put a blue portal behind where the turrets once stood, then go back and shoot an orange portal way back down.
55. Fall a long ways into the orange portal and then you'll find yourself looking down into the next area.
56. Shoot an orange portal quick and then you'll fall back through the blue one and up to where you want to be. Look up past the hole and use portals to get to the upper area you see.
57. Once there, go down an extremely long walkway and open the door at the end.
58. Go down this hallway, take a left, go down that hallway, take a right, go up some steps, then open a door. Go down another long hallway until you see the fizzy static field. Inside, there's the AI.

• YouTube: Portal Walkthrough - Testchamber 19

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1. GLaDOS will talk for a few, then she'll drop one of her balls.
2. Go pick it up and place it beside the closed incinerator on the far side of the room.
3. There's a small walkway that leads to a little chamber that contains the button that opens the incinerator, but it's timed. So when you press the button, you have to use your portals to get beside the incinerator before it closes.
4. Do this to drop the first GLaDOS ball into the fires below. One ball down, three to go.
5. GLaDOS will talk some more. Alright, now you're timed. You have 6 minutes to kill GLaDOS, so work quickly.
6. A rocket turret will appear, use your portals to make it shoot GLaDOS.

• Tip: Putting one portal just below the screen that is above where you entered and then putting the other portal lower on the same wall makes it easier to hit GLaDOS w
• YouTube: Portal GLaDOS Fight and Ending (Time 9:56)