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The Orange Box: Portal Hints
How can I knock off another of the computer's cores?
1 of 15: You don't have any weapons that can do that.
2 of 15: But the RPG sentry does.
3 of 15: You'll need to trick it into firing at the computer.
4 of 15: Getting up onto the platform next to the computer won't help, so think of something else.
5 of 15: How did you trick that other sentry into destroying a window in a room it couldn't normally see into?
6 of 15: That's right -- portals!
7 of 15: Start by firing a blue portal onto the floor under the swaying computer mass.
8 of 15: You can't put a portal directly under the mass due to the fact that there's some round thing on the floor there.
9 of 15: Fire your blue portal so that it's right next to the round thing, and goes partly under it.
10 of 15: Then go over to the nearest wall and open an orange portal in it.
11 of 15: Stand right in front of the orange portal until you hear the sound that means the sentry has locked onto you, then strafe aside so that its rocket will go through the portal and hopefully hit the computer.
12 of 15: It will sometimes miss due to the computer's swaying tendencies, so keep trying until the computer gets hit.
13 of 15: TIP: Quicksave right after getting both portals set up, then quickrestore and try again if it takes too long to get a rocket to hit the computer.
14 of 15: TIP: Run over and set up those two portals right after destroying a core and before the sentry goes active.
15 of 15: TIP: Instead of putting the blue portal on the floor under the computer, you could put it on the nearby wall, directly underneath the large countdown timer. Put the orange portal directly beneath the blue one (near the floor) and stand in front of it until the sentry locks onto you. The rocket may still miss the swaying computer mass, but if your blue portal is well-placed, it's less likely to.
