Changing Split Screen Type
The multiplayer split screen type is determined by the video settings on the Xbox dashboard. For Horizontal split screen, the Xbox must be in fullscreen mode. For Vertical split screen, the Xbox must be in widescreen mode.

Skip Sniper Alley!
Level: Outskirts
How To: Once you have killed The first hunter pair at the start of the level walk through the hole in the wall they created. walk through and look around. there should a destroyed wall to the left of you. jump on to it and make your way upward by carrying on jumping upwards, crouch jumping when nessasery. you should eventually reach the roof tops (it may take a while to find and/or reach). from here head toward the left hand side part of the roof tops. you should see part of the destroyed highway that the first pelican flys along once it has picked up the sgt. jump onto this highway and walk across it. at the other side you should see a slope and in the distance the hotel where the next group of marines are pinned down. jump off the hight way and walk up this slope to reach the hotel skipping the sniper alley.

Get a Scarab Gun
This is done on the level Metropolis and is easiest when done on Co-op. When you start out, cross the bridge. Take out every enemy and even your marines. When you're near the end, Cortana will say something about a "Welcome Party". Three Banshees and a few ghosts will appear. Take them all out. Then 2 Wraiths and 2 Banshees will appear. Take out both Wraiths, and only one Banshee. Have Player 1 continue through the tunnel, but have Player 2 stay outside and distract the Banshee. Once Player 1 reaches the area with the circular opening (a Jackal with a Beam rifle is present), take out the Jackal and head back to where Player 2 is.

Here is the hard part. Get the Banshee to follow both players into the tunnel. Do not board it yet! The first few times it will come at you and fly back out, but stay where you are. It should come back after you. (If it doesn't, go back outside and try again). Eventually, you'll have to get it over two road blocks. Once it is past the second one, have both players stand near the entrance of the room where Player 1 took out the Jackal. It should fly at you and get stuck. Shoot off both of its wings so it can fit thru. Have Player 1 walk slowly in front of the Banshee, making it follow him. Player 2 should be behind it, gently pushing it. Take it to the left and get ready to board it. As soon as you hit the checkpoint, the Elite in the Banshee will disappear. You only have about a second to get in before the Banshee also disappears. Both players should press X quickly. If done right, one of the players will be driving the Banshee!

Take it outside and directly up. Very high in the sky are two skyscrapers with two bridges connecting them. In the middle of the bridge closest to you, there is something that looks like a plasma rifle. It's actually a Scarab gun! It has infinite ammo, so have fun. Just don't aim at the ground.....

Two hidden swords on Halo Delta and a fight to skip.
On Halo Delta, get to the structure where you can't go any farther with the tank. As you enter into the area, go left up the ramp and then up the little ramp until you come to the large block butted up against the wall. This is where you jump up to get to the Envy Skull (consult for more detail). There is a secret entrance behind this large cube.

I found the easiest way to move it was with the tank, although grenades do the trick just as well. You can drive the tank up there with a little patience. Aim at the WALL to the left of the stone, The explosion with slowly move the stone out of the way. Once the path is clear, walk up the dark ramp and there will be two dead grunts and two swords. There is also a high ledge in the next room that you can grenade jump up to, and then frag grenade jump up one more level -- allowing you to skip the fight inside the structure.

Skip fight around the Delta Halo tower
After the cutscene with the hologram regret telling you how he will start the ring in Delta Halo, continue until you see a crate. Then jump on it, then onto the legde. walk around until it loads the checkpoint. You will have skiped the battle.

skip half of outskirts
(From the beginning of the level where Master Cheif is alittle dazed) Go straight out the door in front of you that leads to the street. kill the grunts and take out the sheild baring jackels. Head down the street towards the two dead ends. Look on your right and you will see two alley ways that will connect to each other in this little sort of "room" in the alley. Go into that room and look back towards the street. You will see a dirt mound that is in one of the corners. Get on the dirt mound and grenade jump up to the next ledge. Look left you will see another ledge (top of a building) you should be able to jump right up to the ledge ,but probably not on the first try. When you are on the building you can continue jumping from building to building all of the way through sniper alley. Once you reach the building that says "Zanzibar" on it is the point were you cannot get any farther using this way.

Once you are on the first building walk over to the edge of the building that faces the street. Look right and jump onto the building next to you. Keep working your way back and try to stay as close as you can to that side. You will eventually come to the free part of the level where if you look right you will see a Pelican come. If you had to look fight to see the pelican you are on the left side of the freeway. if you had to look left to see the pelican you are on the right side of the freeway. If you are on the left side of the free way go left until you see a street (on your right side) that is torn up and the end it looks like. Jump off of the freeway into that street and you can walk over the damaged part of the sreet ( a hillish type thing) And that will put you at the building that says "Zanzibar" on it. If you were on the side of the right side of the freeway then crouch jump onto the buildings in front of you. Look on your right you will see a place were the height of the roofs drop and a certain roof is orange and red. If you don't see it go right and alittle bit forward until you find it. jump straight on to the roof. If you jump onto the slanted part an invisible barrier will block you from going up. once you are on the building go up the little slanted area (make sure it is the up hill one) You will see two airvent/airconditioning unit things on the roof jump on one of them and onto the next building. head straightyou will see the building that says "Zanzibar" on it. It is a good idea to kill the covenet below before jumping down. Then it is back to the normal level.

Banshee In The Control Room
To get a Banshee inside the room where you fight Tartarus first get a Banshee. After the Scarab destroys the front door fly inside and go straight up as soon as you enter. It's easy to navigate to the next door, get out of your Banshee and make the door open, then get back in your Banshee and fly through. Once the Brutes come through the next door you can kill them or fly past them, but it is important that you are not in your Banshee when the cut scene starts to make sure it is there when you walk back.

Skip Banshee Flight in the level "Arbitor"!
When you first get to fly the banshee, zoom towards the tower to your right. When you get closer, a nav-point will appear. Go to it and the game will automatically advance to that spot in the story. By doing this, you've skipped the grueling 20 minute-long Banshee flight. On the downside, however, you don't have much of a chance to grab a Fuel Rod Cannon.