Turn Him Into A Clown:
When faced with the enemy tank, turn to the left 4 times and then press A, X, Y, Black. Your player will now turn into a `Bo-Bo` type clown.
All Weapons Multiplayer mode:
Go up to an Elite with a sword, and kill him by hit him with a machine gun. Once you have killed him go on until you get to the next checkpoint. Once have got a checkpoint turn your Xbox off and then on again. When you go back on to that level again you will have all the weapons there are.
How to turn invisible with a shild:
Fined two items one is blue that is the one to make you invisible and the other is red that gives you a shild.
Unlock Levels:
The cheats these other fools have submitted are obviously garbage and made up. You can unlock the foundation MP map by finishing campaign mode on easy. there are also two other maps to unlock: Marathon and Conclusion. Try finishing harder campaign modes to unlock these levels.
Dueling Rocket Launchers:
Set all weapons on rocket launchers and begin a multiplayer game( You can be by yourself).You should begin with a rocket launcher,Then stand over another rocket launcher and simply press Y(30) times, when done you should pick up another rocket launcher, and then would be freakin`
King Osman Gun:
As soon as u start a multiplayer game, pause the game immediantly and press L,R,L,R ,up,down,L,A. this will cause you to start with a King Osman Gun next time you die.
Master Chief turns into Samus:
Go to Metropolis under heroic mode and as soon as you appear dont move. Look directly up, then directly down, then look striaght. Click the left trigger and hold it down and press Y,Y,B,White, Y,B,A,A,A, White, X,Y,Y, A, Black. After that done, leave game, go settings, create a profile with the name being "Samus". Restart your Xbox and in campaign, under heroic, Master Chief should now be Samus
short cuts@fun stuff:
1. First, on outskirts. Go to the alley under the elite on the roof. There is a small structure. Walk to the dirt pile get on and do a crouch-jump onto the structure. Turn to the side and do another crouch-jump to the ledge across. Turn around and jump onto the red roof. And have fun with the wonders of the rooftops.
2. On the level "Regret" after you kill everyone(optional) on the bridge after the brocken one there is a block that is covered in plants. Jump on it then jump onto the piller in front of it. Then jump onto the ledge then turn to the right and there should be a place covered in hang-over vines. Go through it and you will end up on the other side. Jump down onto the bridge where the gondala luanches. This will take you around the entire center.
Unknown Skull:
At the begining "Armory" wait in the room until the Sarge starts telling you to get into the elevator. You MUST wait for him to say "Would it help if I said please?" When he says this, get into the elevator and go down to the tram. Get on the tram and face towards the INSIDE of the building. Press up against the glass doors towards the inside of the building. You should hold `X` down, and you should pick up the skull. It`s on a stack of green crates, near the end of the tram ride.
Crazy mode:
On the first level go through the archway beside the lake of blood. Once you`re on the other side turn to the left and you will see a green leafy plant. If you walk up to the plant and press x, right trigger, left, up, down. Commander in Cheif will eat the plant and go crazy. He will run around and do this wierd dance.
Clone army:
In a tank press A three times and then get out. now jump up three times and shoot three bullets of each of each gun you have. wait and after three seconds two more master chiefs will come on to the screen and will follow the same instructions you give to the original.
Beserker mode:
On the first level go through the archway beside the lake of blood. Once you`re on the other side turn to the left and you will see a green leafy plant. If you walk up to the plant and press x, right trigger, left, up, down Commander in Cheif will eat the plant and go crazy. He will run around and do this wierd dance that is so crazy. Sometimes you just say wow that is crazy.
Stripper Mode:
During the Campaign, Successfully Press, A,X,B,B,Y,Right Trigger, Left Trigger, Right Click, X, Y, W, B, W, B, W, B, W, B, W, B, Right, Right, W, B, Black, Y, A, X, B, Left Click, Left Trigger, Left Trigger, Left Trigger, Left Trigger, Right Trigger, Back, Start, Start, Y, B, X (Board a Ghost with this last button).
Make sure that you are over a pile of weapons because you want to be dual wielding throughout the entire code. The result will be once you get out of the ghost after u kill at least 5 enemies by boosting, that you will be transformed into a cortana looking HOTT Female, wearing the Master Chief Helmet. Some how master chief has taken the role of Cortana. If the code doesnt work try again!!!! it has to be timed correctly.
Unlimited Ammo:
This code will work only if you have completed the game at least once on legendary difficulty.firstly,start a new game on hard or legendary difficulty.During the armory level,approach any elites and kill them with melee attacks.weapons should not be used as this will not enable the cheat.immediately after killing an elite,turn off your xbox and switched it on again.you will be pleasantly surprised that you will get unlimited ammunition for all weapons!
Tactics:
If you are in a closed area (small room, hall way, etc.) then hold only 1 weapon, so you can throw grenades. If you are in a open area (big room, outside, forest, etc.) than have 2 weapons in hand because grenades will be useless.
Be The Gunner:
Get to a `Hog and jump in the gunner/passenger seat and let the marines drive. It will be x2 more effective than you driving (it depends on your skill).
Weapons List:
Here is a Complete list of the weapons:
Legend:
x:can dual
h:can head shot
z:can zoom once
z:can zoom twice
l:can lock on
s:Splash damage
b:uses a battery(non reloadable)
sp: Single player only
Weapons
1.Magnum(pistol) x,h
2.SMG x
3.Battle Rifle z
4.Shotgun s
5.Sniper Rifle 2z,h
6.Rocket Launcher l,s
7.Plasma pistol x,b
8.Plasma rifle x,b
9.Brute plasma rifle sp,x,b
10.Covenent Carbine 2z
11.Brute shot s
12.Needler x,l
13.Covenent sniper rifle 2z,h,b
14.Fuel rod cannon s,sp
15.Sword l
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