First go to Quarintine Zone. Next look around to your right side and you should see a small tunnel. Walk through it. Now keep on going strait till you see a strip of land that is connected to the wall (There are many strips of land connected to the wall so pick the one that has kind of like a part of a ship or metal hiding it). Walk down the strip of land ( careful not to fall off ) till you reach the end and you should see a floating skull. You must do this on Legendary.

This skull makes things have bigger explosions and more
powerful melee attacks.

When you crash on the level Outskirts step outside and you will see a grunt, kill him. Now look up to you right and left side. You will see two lights. Jump on one and grenade or crouch jump(grenade jump is a little hard on a light)up on the roof. Look around and you will see a small dark pathway. Walk down ithe path and you will find a skull and a couple frags. Pick up the skull and your HUD will disapear. Do this on any difficulty.

On the level the Armory get done with the testing. Johnson will come in and ask for you to come in the elevator. DON'T until he says would it help if I said please enter elevator. Walk across to the second elevator, enter, and go to the inner part so your looking at the battlefield. Then Johnson will go on about nothing will get passed here in one piece. Get close to the window and hold X. Tje skull should be on a crate that you are passing. You must do this on Legendary.

First get the sputnik skull in Quarintine Zone. Second go to the great journey and obtain the black eyed skull.Now go to the level Metropolis (whack enemies for overshield)and get a ghost get to the part where you need to save marines stuck in a building. Get a good distance from the wraith at the brigde. Face the bridge and wraith and get out of the ghost. Place to 2 frags under the Ghost and get in. Start driving foward (not fast or too much).You should go flying foward and land on a platform.

When you get to Regret in the level Regret dodge the honor guards and charge for Regret. Press X on his chair and you will be riding his chair. Now? Beat some sense into him.

With hunters shoot them in the exposed neck with a sniper and they should die . I tried this on normal so im not sure about heroic and legendary mode.

At the end of the level the Arbitor when get a Banshee go to the Bottom of the structure. Look around and you will see something like a bridge that looks like it is holding the structure up. Check under the bridge and you will find 2 ramps on one side will be a number of grunts dancing around a skull. Pick up the skull.You must do this on Legendary.

the propane tanks can be found in a lot of places. if you shoot the caps off. it should start flying every where. becareful they can hurt.

the ghost on lockout is fake. it is just a computer rized spartan. they say that a guy goes to eat then the ghost showes up but really he is just another character. it's fake by how the guy reacts to him. the main guy just waits for the so called ghost to kill him.

the hole in lockout is fun and easy. go to where the glass in the celing is and you can go to the worp pad or to the bigger tower. crouch walk up in the wall by the door down to the worp pad. go to the left of the light. move right slowly till you get to the third black line in the light. while doing this keep jumping and it might take a few trys but eventually you will get it. you will know if you have done it by when you fall throuh the wall and land on the other side. yes the gardians can still kill you while you do this.

go to the middle of acension with the banshee. flip the banshee on the path way between the banshee pad and the center of the map. flip the banshee like your doing the banshee jump.( you will ned overshields and rockets) now do the banshee jump and if you did it right you should fly past the banshee pad and fall to the bottom of the map. now you can walk around. this might take a couple trys but it's fun in the end.

I was just looking at some of the old tips and tricks back then and they discussed the same thing over and over, I mean they had to make an archive for THE GOLDEN WARTHOG that everyone keeps fussing about. Well if you havent figured it out yet theres no such thing in the game. I can tell you how to get an invincible warthog but not a golden one. Anyway I dont know if you knew this already or not but to go in to ease down position just press down on the directional pad. To get out of it press down again, melee, or shoot. Anybody else know a trick that hasnt been mentioned before???