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Cortana

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Find Cortana

Cortana is easily Halo 3's most annoying and challenging mission. You'll be up against what seems to be a near limitless amount of Flood who can destroy you within seconds. Also, because of the Flood's semi-random, unpredictable nature, offering a strict step-by-step walkthrough to killing the Flood is near-impossible, so instead, we've concocted a guide on how to run past most of them! However, before we get to the walkthrough, there are a few basic tips that are essential to completing this level:

To get things started, ignore the "infection" Flood for now, and just follow the path up to the first door. You'll encounter a few Combat forms along the way, but they're nothing your melee attacks or shotgun can't handle.

After the first door, head left down the split path and drop through the hole in the floor.

Now things start getting difficult, or at least they would if you actually tried to battle the Flood. Instead, we're going to employ our patented "run past everything" tactic for now.

As soon as you drop in, begin jumping up the ledges on the right (as shown on the map above). Now follow the right wall into a tunnel, leading to a door. You may take some damage, but you should be okay. Just keep running, and jump over any enemies in your path.

Follow the path up to another door - you shouldn't face any resistance here.

Turn right to come across a crashed ship. Proceed up a steep ramp on the left of the ship, near its midpoint. Collect the sword on the ground, then drop into the hole at the peak.

You'll drop into a room with a downed purple ship just ahead. Run straight across it (but make sure to collect the Cloak from its right half - you'll want it soon) and enter a tunnel on the opposite side.

Chug through the tunnel, passing by several carrier types, and continue up the nearby hill. Activate your camouflage near the top, and just run like the dickens, leaping over any enemies in your way. You'll soon reach another door.

This spiraling maze-like room is utterly confusing to navigate, so don't fret if you get lost a time or two (or a dozen). But we'll try our best to navigate you through it. Remember, you're going to run through this entire portion, but keep your sword equipped at all times to kill any enemies in your direct path, if you can't jump over them.

After running into the room's center, climb up the ramp on the left side. Hug the right wall closely to collect a Cloaking Device, and continue to follow it into a second tunnel.

Shortly after exiting the second tunnel, look for a gap you can jump on the left. Jump across to a thin strip and use the sword to kill the Flood here. Continue up a tunnel on the right to emerge on the top floor of this room.

Activate your camouflage now and jump across the platforms bordering the left wall to cross over to a door.

Just run through the unguarded tunnels through another door.

You'll emerge in a giant, circular room, with a mechanical structure in the center. Run along the path (ignoring the enemies) up to the first locked door. Turn left and walk across a thin bridge leading to the central structure.

Turn right from the central structure and walk across another bridge and continue through a series of blue doors. You'll soon emerge in a room containing a glowing blue bulb - that's where Cortana is. Bust it open by meleeing it several times to retrieve her. With Cortana onboard, head back through the blue doors to the large room just before.

Destroy the Reactor

As you step back into the main room, Cortana will inform you that you must destroy the generator. Cross the left bridge back to the central structure (you should pickup a Bubble Shield just before the platform, as shown on the map above), and interact with the control panel to reveal three reactors, surrounding your platform. Toss grenades toward at the platform surround the three reactors to take them out - since all three are nearby, there's no need to leave the central platform. However, the enemies nearby may prove difficult - take out any on the platform, and deploy a nearby bubble shield to protect against distant fire.

Escape High Charity

Once all three cores are destroyed, you must escape the area. Quickly charge across the metallic bridge and continue through the hallway ahead and drop through a hole.

Essentially, you have to backtrack through the entire level, to a waiting Pelican near the level's beginning. As long as you keep your energy sword equipped, you can run through most of it, but this first section may prove difficult.

After dropping through the hole mentioned above, have your sword ready and kill anything that stands in your way. You'll soon come across a ramp on the right - climb it and drop off the far side for a shortcut allowing you to bypass most of the enemies.

When you reach the fallen ship, head straight across it into a hallway. Slash through the enemies here, and watch out for a Brute form - you may want to use a grenades to take him down. Jump into the opening on the right and follow the path up to a hole.

Now follow the left wall, running past all the enemies up to another door. Cortana will soon remark "who would be crazy enough to come here" - follow the right wall from here on out to come across a Pelican you can board to escape the level.