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Unlock New End Movie

Beat the game on the Legendary setting to unlock a longer, different final movie.

Alternate ending sequence

Successfully complete the last level of the game in campaign mode under the legendary difficulty setting. The new ending features a human and alien fighting hand to hand. The human will say "Its over", and then they hug because they know the explosion will kill them both.

Defeating Flugs

In the later levels of the game you will encounter new enemies called Flugs. These enemies will be small at first, but they will attack and control anything alive. Use a shotgun on these baby Flug as they tend to group in large numbers. By using the shotgun it will send a storm of bullets and kill most of them that are around. Use a shotgun on the possessed Flug, and it will kill most of them in one shot. This is made easier by the fact that most of them carry shotguns.

Defeating Grunts

When the Grunts are sleeping you can beat them to death with the butt of your gun without waking up any of the other Grunts. You can usually kill a four to seven of them before an alien spots you. They start sleeping in level 5, Assault on the Control Room. Just remember not to shoot or they will wake up.

Defeating Jackels

Use a photon weapon to destroy a Jackel's shield quickly. When you encounter a Jackel, run up and hit it with your weapon or get out a gun that uses bullets, not energy.

Covenant dropship

When Covenant dropship is getting ready to unload a group of Covenants, throw a grenade into the door as it opens. The blast will kill several of the enemies since they are all in one area.

Assault On The Control Room: Spinning ring

At the Halo start up screen, choose multiplayer mode. Choose cooperative play at the next screen, then choose your profiles at the next. Choose the level where in the beginning it says, "I would have been your daddy" (Assault On The Control Room). On the difficulty screen, choose legendary. When the level starts after the introduction sequence, have one of the players quickly press X when the "Press X to get on the Pelican" message appears. That player will re-board the ship and start flying with it down the hole. The other player will quickly die because of the aliens, and will be respawned on the spinning ring. Make sure to jump where there are gaps. If you are good enough, you can even jump to a nearby ledge. Additionally, once you are respawned on the ring, quickly jump off and fall to your death. Sometimes you will be respawned on the lowest ledge in all the blue haze, and a "Press X to flip the Pelican" will appear that the top of the screen very briefly.

Fireworks

Through one plasma grenade in a wide open spot, then stick another directly on top of it if you do this fast enough the first gernade will launch the second and vuaola fireworks.

Your in My Seat

When one of your computer controlled buddies is in a vehicle spot/seat you want simply go over to that spot and press X. They will graciously move.

Infinite Grenades

To get infinite grenades, scorpion, and ghost in multiplayer- Go to the multiplayer screen: go to edit game types: In that menu you will have the option to make up your own game type.

Shortcut

Play "Assault on the Control Room". It doesn't matter what difficulty setting or if you are playing 1 or 2 player mode. Get to "If I only had a super weapon". Rush right ahead and ignore the Jackals and the first Elite. Instead, kill the second one as he is somind over the hill. Then run to the next one who is coming around the banshee. If you kill them both, the two banshees will be yours for the taking. I would suggest using the Plasma Rifle for killing them, as it stuns. You can use the 2 banshees for a banshee fight with a friend, too. Anyways. Ignore the enemies and do not go to the end of the bridge. Instead, go to the top of the hill that leads to the Control Room. There will be no Hunters, or aliens on the way up the hill! There will be the enemies that come out of the big door, though, but this shave's precious time off the level.

How to get a Banshee sooner than the bridge

Assault on the control room: How to get a Banshee sooner than the bridge, 1 player.

Fight your way through the level to the first snowy open area, kill the enemy tank and all the rest of your enemies then hop into the Warthog. Make sure you get the Rocket Launcher and the Sniper Rifle. The next open area has a battle raging and an empty Scorpion, hop into the Scorpion and waste all the Covenant with the cannon. To the left is tunnel, to the right is the obvious way to the next open area, go to the right and clear the enemies around the corner. Stop (If you kill all the enemies in the next open area an Elite will get the Banshee before you do and use it to attack you. You'll know you're in the right place if there's another enemy tank in the area.) Now, jump out of the Scorpion and stay to the Left edge of the valley. Look up, you should see a Ledge above you with some lights on the underside. The Banshee is on that ledge so get underneath it and shoot some rockets up to knock it off. Remember to move something forward with concussion weapons you have to shoot behind it, so use you brain. If done correctly off will tumble the Banshee, if done incorrectly it will be pushed farther in. As an added bonus the last few sections of the level will have no enemies due to the fact you've skipped so much.

Plasma Grenade

If your going to use a plasma grenade, try throwing the grenade on the alien where it sticks onto them. It will blow up on them making sure it will kill the alien. Also the aliens can do this to you if you don't move.

Name in Blood

In the very last level of the game, as you're driving the Warthog out of the Pillar of Autumn, on the second jump, do not go all the way across. Then back into the room thats behind you and get out. if you look on the wall the name REX will be in blood on the wall.

Hungry Grunt

In the very last level of the game, as you're driving the Warthog out of the Pillar of Autumn, get out at the 2 tunnel off of the main one and there will be a grunt at the end of it. he should say something like " I can't wait to get back to the ship and eat some grub!"

Good tactic for legendary

Here's a good way of killing elites or hunters in legendary. get a needler and some ammo and just unload it on an elite and watch the show --NOTE-- You have to get in close enough for the needles to find their mark, and the delay until they explode leaves you wide open for their plasma rifle, so bring a backup weapon.

For the hunters, unload an entire clip at their backs so the shot doesn't reflect off their shield and start shooting at them with another weapon while waiting for the needles to explode (or just sneak up on one and smack him in the back, and if you cant to that...a well placed plasma grenade to the head should weaken it, but it will most likely just piss it off.)

Silent Level shortcut

This will help if your annoyed by always having to go back because the yellow dude locks the door. First find a warthhog and get some people inside. Go where the place where there are lots of guys and where kortana says the covenant are putting up a real fight. Go down completely with your warthhog and go at full speed directly where the yellow dude is. If you did it right then your warthhog will be half way through. Press forward and get out. Then pass the level like you usually do and come back where the warthog is stuck. You may think it is impossible to get out but just press back and then get out. You will be in back of it and now you're done the hard part!

Elite Kill Trick

In the levels where you must face the Covenant there are certain aliens called Elites. They are the big ones which are usually blue, red, or sometimes yellow. If you have a gun with a scope ie; pistol or sniper rifle,try to get behind an elite without being seen by it. Next, Zoom in at the back of it, you will see yellow spots on his back or his head. If you shoot them a yellow liquid sprays out and they die instantly. This cheat helps because you only need to use 1 bullet and you do not have to get in close to kill it. It also looks cool when the yellow stuff sprays out.

Kill Master Chief in Cinematic

This is only possible to do in co-op mode, so get a friend to help out.

Near the end of "Assault on the Control Room", at the base of the big pyramid-type building, rush over and steal a Ghost from the two parked ones.

Get the Ghost (in one piece) to the top of the pyramid (Get your friend to do the fighting while you take care of the Ghost). Open the large blast doors, kill whatever is in your way, and keep going down the hallway.

When you reach the VERY LAST door (ie. The one that triggers the cinematic), stop. Line the Ghost up with the centre of the door as best as you can, and back it up about one or two Ghost-lengths away. Have your friend hit the switch to open the door, wait a half-second or so, and then gun it towards the door.

If your timing was right, the Ghost should JUST fit between the doors, and during the cinematic the Ghost (now without a pilot) will mow down Master Chief from behind, killing him. The cinematic will go on as normal, except for the absence of Master Chief (you will still hear his voice, though). Also, in certain camera angles, you will see Master Chief's corpse in different poses, such as tilting 45 degrees to the left with his gun stuck in the ground.

It will work more than once (I've done it three times so far), and it just looks damn funny to see Master Chief get run down by his own Ghost. Props to The Fiend for co-piloting.

The Yeti

This isn't so much a code. It's just something that shouldn't be where it is. In the level "Guilty Spark 343", there is a crashed Covenant dropship just around one of the corners you must turn (the second or third, I believe). Up above this dropship is a tree jutting out over a ledge. On this object is a Flood-infested Elite (the bulkier Flood ones that don't pop). It appears as you come around the corner and runs back along the log after a few seconds then disappears. It is named 'The Yeti' because it diappears whenever seen. This is really weird because the Flood have yet to be introduced at this point. Also, the Yeti is invincible. You can sneak up on it from behind (which is too long and tedious a subject to go into), but don't have your co-op partner go around the partner until you're in position. It can withstand a pistol whip to the back of the head and a plasma grednade, so we just gave up. It's really fun, though. I suggest you try it.

Easy Flood and Covenant Kill

This one works with all of the flood exept the little spider ones. Grab plasma weapons exept for the needlers. Shoot the plasma weapons at them and the flood will fall down and keep shooting them until there is blood all around them. For the covenant, shoot the plasma weapons at them. If you shoot elites, it only should take a few shots to wear down their energy shield with Plasma weapons, then shoot them 3 more times and they'll die. It should only take 2 shots at the most for grunts. The jackals have sheild but you can wear them down with plasma weapons and 2 shots to kill them. You have to switch excessively because the battery runs low. Finding plasma weapons shouldn't be a problem because the Flood and the Covenant carry them all throughout the game.

Defeating the Second Level

To defeat the second level on Halo easily, the one where you have to kill all the aliens and rescue the survivors, kill the survivors instead. It's much easier and quicker then.

Kill The Captain

If you are in a happy and silly mood try this: at the first level when the captain gives you a pistol, get out of the room to the place where you see the first grunts. kill them and go back to the captain's room and kill him. Its so funny. Cortana will say, " WHAT THE HELL ARE YOU DOING? Security to the bridge. The master chief has gone crazy". Then you will get locked inside and the troops get invincible and come and attack you because they think you are a traitor. (if you are playing 2 player mode and one of you kills the captain, the other player poofs to the captain's room and gets locked too)

Glitch on the last level

This isn't really a cheat just something to fool around with because i have gone through the game looking for fun errors (and found lots). On the last level (the maw, chapter: .....and the horse you road in on) i was messing about and found this, when you start the level your inside one of the escape pod bays (a small tunnel like thing), walk out of this one and to your left there should be another, walk in here and walk directly down the middle, look down and you should see a really big fall onto a cliff, walk as close to the middle of the tunnel as you can and then walk of the edge, you should fall bounce off a small hill and land still alive (try again if you died), you will now be stuck on this cliff and you can have a look at the ships outside and see how much detail the makers have really put into the game......have fun!!!!

Fewer Enemies on Assault on the Control Room

When yopu get to the first bridge on the assault on the control room, turnt to your left and Jump off (should only be done in 2 player cooperative). there will be a ledge. follow the ledge down until the end ofit. Kill one of the players. when the dead players screen goes "waiting to respawn" you then jump down onto the next ledge and try and slide off it. if you fail try again and again. so that the dead player respawns onto the next ledge than try and attemp to slide off the rock. than if succeeded go to the landing pelican. go upto it andf than press x. it will than take you to the scorpion tank. Use that of the warthog to go to the next door. when there get the banshee. and fly around and do what ever you want.

Flip The Pelican

This code can only be done on 2 players. At the beginning of the level: 343 Guilty Spark, have both players stay inside the Pelican by rapidly pressing the grenade button until both players throw the grenade. The Pelican will soon fly off with both players riding in it. Once the Pelican gets to the area with the 2 dimensional trees, have one of the players jump out. While the player that jumped out is falling, on his screen it will say: "press X to flip Pelican". Have the player that jumped out rapidly press the X button. If done correctly, the Pelican will miss the spot where it normally would land. Have the player that stayed in the Pelican get out as soon as it lands. Look on the player's screen that just got out of the Pelican. On his screen it will say: "press X to flip Pelican". Press the X button and the Pelican will flip over on it's top. Press the X button again and it will flip again and land normally. From here, you cannot flip over the Pelican anymore, however, you can melee it with your weapon and it will slide, just like any of the vehicles that you can drive. This glitch cannot be done on 1 player because if you jump out, the Pelican will disapear, and if you stay in, the Pelican will land safely and you will not be able to flip it over.

Flip The Wraith

The Warthog and the Sniper Rifle is required to do this cheat. Move through the level: Assault On The Control Room until you get through the tunnel that slants up right after the part where it says "Rolling Thunder" at the bottom of the screen. Just ignore the Covenant Dropship that comes down and drops off some Covenant and two Ghosts. Quickly, get out of the Warthog and run to the top of the small hill that has a Gun Turret on it. Zoom in your Sniper Rifle twice and look to the left of the empty Wraith Tank sitting on the ice. You will see an Elite running for it. Quickly, kill him and then take out the rest of the Covenant so they do not destroy the Wraith on accident. Once all enemies are annihilated, get back in the Warthog and keep ramming one of the back corners on the Wraith. If done correctly, the Wraith will flip over. Then get out of the Warthog and walk up to the Wraith. On the screen it will say: "press X to flip Wraith". You can flip it over, however, you still cannot drive it. Explosives will not work to flip over the Wraith, as they would just destroy it.

Frozen Marines

On the level: Assault On The Control Room, take any vehicle and move through the level until you get to the part where at the bottom of the screen it says: "Rolling Thunder". Instead of going forward and look back at the Marines (if you helped them survive through the level until this part) that were chasing after you on foot. They will be frozen in running position. This happens because you took a vehicle through the checkpoint. I recommend not killing them, because if you go through the level normally and come back, they will be unfrozen.

Alternate Ending Movie

Beat The Maw on legendary difficulty to see a new ending movie. The new movie will feature the Sarge and an Elite fighting over an Assault Rifle. Then, both of them will look towards the Pillar Of Autumn as it starts to blow up. The Sarge will then say to the Elite: "this is it baby, hold me". Then they will hug and the game will get back to it's original ending movie with the Chief flying off in the Longsword.

Magical Flood

Play through the level: Two Betrayls, until you get to the part where it says: "Final run" at the bottom of the screen. Instead of going straight forward to the battle where the Flood and the Covenant are fighting, look to the left and you will see a small hill with a large tree and a few small rocks to the left of it. Go towards the hill and jump over the rocks and go to the left of the tree that will be right in front of you. Ahead you will see a small tunnel. Get close enough to the tunnel that you are inside it a little. If done correctly, Flood will appear out of nowhere and attack you. This is suicide, because some of the Flood members that appear have Rocket Launchers.

Dime A Dozen

This is more of a technique than a cheat. It helps you to kill elites. Heres how you do it: First, you need a plasma pistol and a human pistol. When you have those, use the plasma pistol first. Charge it up completely. Once charged, shoot the elite anywhere with the fully charged plasma bolt (taking off his shield). After that quickly take out your human pistol and shoot the elite in the head. Note, this will kill any elite instantly if done right. If you don't shoot his head, it only takes a few body shots.

Easer kills

Covenant:

Grunts: Any weapon.

Jackals: Human pistol.

Elites: Plasma weapons/assault rifle/sniper rifles/rocket launchers.

Hunters: Rocket launches/grenades/assault rifles.

Flood:

Little dudes (parasites): Assault rifles.

Cadavers (body