Portal 1 Walkthrough Video Guide (PC, Xbox 360, PS3, Mac)

Chamber 11

Head out the lift and up the stairs, shoot a portal on the wall and wait until the device shoots an orange portal, head through and press the red button.

Wait until the orange portal gets shot onto the wall behind you and head through, shoot a portal on the wall under the device, once you have shot the portal, you will need to wait until the portal gets shot onto the moving platform.

Ride the platform to the middle platform and pick up your second portal gun, make your way over and press the button, shoot your orange portal at the top left hand corner for your exit.

Turn around and jump back onto the platform and shoot the blue portal in front of you, you will need to make your way to the lift and head to the next chamber.

Chamber 12

First thing you will need to do is look up and shoot your orange portal on the white platform above, jump down and shoot your blue portal on the floor.

Once you have made it through your blue portal, you will need to shoot a second orange portal on the white platform above, looking over the ledge again to shoot a second blue portal, throwing yourself to the floor through the blue portal.

When you land you will see the panel will move out and line up, shooting your orange portal on the out panel, you will then need to look once again over the ledge and shoot a new blue portal.

Pick up your cube and jump over the ledge and place it on the button. Make your way down off the ledge and shoot a portal to the right of the blue portal, this portal needs to be blue as well.

Once you have jumped through this portal you will find yourself at the lift which will lead you to the next chamber.

Chamber 13

First thing you will need to do is place your portals so you can pick up your cube.

Once you have picked up your cube, you will need to place it on the button, you will see the button will open a door on the top right platform.

Shoot your orange portal through the door and the blue portal on the wall next to you, head through your portals and you will arrive in the next section.

You will then need to shoot an orange portal on the left wall allowing the energy ball to float through and the blue portal will need to be directly above the device.

This will cause the ball to fall into the device.

Your next task is to get the cube off the platform, shooting the orange portal above the platform, you will need to shoot your portal under the platform on the left. Wait patiently for the platform to move across under the blue portal and jump down to pick up the cube.

Once you have picked up your cube, you will need to shoot your orange portal above the button and your blue portal under the cube, place the cube on the button.

You will see a door open, shooting your orange portal here and your blue portal near you, jump trough pick up the cube and place the cube on the second button.

Once you have done that, place your portals above the small platform near the door and one on the floor near you, this will allow you to get to the lift to Chamber 14.

Chamber 14

First thing you will need to do make your way up the stairs, you will need to place your orange portal in the top left hand corner, you will then need to place your blue portal off the ledge and drop down to pick up your cube.

Head down the stairs and place the cube onto the button and head through the door. Making your way across the platforms, shoot an orange portal on the left next to you and a blue portal across the way, head through the portal and shoot the blue portal on the wall where the cube touches.

You will then need to make your way back across the platforms, and watch out for the bouncing energy ball whilst your running through the door.

Make your way through and make your way back up the stairs in front of you. You will need to place the other portal above the device.

You will then be able to make your way over to the moving platform which will take you to the lift to the next chamber.

Chamber 15

Chamber 16

Chamber 17

Chamber 18

Chamber 19

Part 2 of our video guide to completing Chamber 19.

GLaDOS Boss Battle

Here’s the final boss battle against GLaDOS! It ends with the fantastic ending song titled “Still Alive”.

Before the release of the sequel, the PC Steam version of the original Portal received an updated ending to make the jump between both games make perfect sense.