Portal: Still Alive/Challenge Map 9

Gold Standard: 5 Portals Strategy for 3 Portals:
 * 1) Proceed forward and shoot a blue portal onto the left upper wall as close to the portal immune wall as possible.
 * 2) Shoot an orange portal onto the lower level wall.
 * 3) Proceed through the orange portal and if you are quick enough you can take out or jump past the sentry. (Jumping backwards may help)
 * 4) Use the wallclimbing glitch with the sentry gun to make your way up to the platform with a cube on it.
 * 5) Throw the second sentry gun to the middle level.
 * 6) Place an orange portal on the back wall where you get the cube so that it is opposite the doorway.
 * 7) Take the cube with you and throw it on the second button.
 * 8) Carry a sentry gun over by the original blue portal and use it to deflect the power orb into the blue portal.
 * 9) Once you get it in the portal, quickly follow it, duck, and stand on the button so that it goes through the open door and is caught.
 * 10) Drop down and proceed to the exit.