More:Halo 2: Missions: Gravemind

From GameWinners

Contents 1 Angry Skull 2 Beamsword 3 Shortcut 4 Man in boxers 5 Screaming Marines

Angry Skull

Play the level under the legendary difficulty setting. Fight your way through the Covenant city until you are outdoors. As soon as you are outside, turn right. You will see some Covenant crates next to a rock ledge. Jump from the crate to the ledge. Walk up the hill, and to your right will be a red girder. Jump on the girder and follow it back towards the area you just came from. There will be a cloaked Grunt with a fuel rod cannon. Kill him and continue down the girder. You will see a skull floating above a small gravity lift. If you get this skull, the word "Angry" will appear. This will make Grunts shoot faster, but you can use it as a blunt weapon. The Angry skull is the only skull you can cycle around as a third weapon.

Beamsword

At the point where Cortana reverses the first gravity lift, there is a dead Elite that can be seen as you are going down. Usually you must do this at least twice to get the angle of which to jump correct. Jump into the reversed gravity lift and hold or tap [Jump] while pressing [Forward]. You should break free of the gravity lift and land near a dead Elite with white armor. Take the Beamsword and hop back in the lift to proceed with the mission. This makes it easier to keep your soldiers alive through the close quarters and hallways.

Shortcut

As you are walking past a certain point, you will reach the teleporting bridge that glides you across to the other side. After you come out of a door with an overhang or see one like it, try to push a crate up to it. Jump on top of it. Once on top, try to jump on top of the red bars. Then, jump over to the big stretch of white trellis and walk on it all the way over to the other side. You can do this multiple times. and it is a good way to avoid the battles with the Elites, Grunts, Brutes, etc.

Man in boxers

Under the legendary difficulty setting, watch the intermission sequence where the Brute honor guards are attacking the Grunts and Jackals. When you see the Grunt climb on the pillar, the camera will pan to the right and show some Grunts jumping. You can see a man in boxers with the grunts.
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Screaming Marines

Get to the point where you release the Marines from the jails. Before you go down the lift, put one of the large boxes over the one that goes up. After you release the Marines jump up to that level (grenade jump or get creative). The Marines will try to go up. Then, jump back down and look at the lift. All of the Marines should be stuck. Their mouths will move and make a really strange sound. Shoot them one at a time. They will cringe, screamm and moan in unison.