What are the cheat codes for Halo 3?

Answer 1

i found this at gamefaqs.com it is a great website for all your gaming needs!Codes

The following cheats can be performed during a local match or replay only. You must simultaneously PRESS & HOLD the following buttons for 3 SECONDS to toggle the effect on / off.KEYS:

LB = Left Bumper

RB = Right Bumper

LS = Click in on Left Analog Stick

RS = Click in on Right Alalog Stick CodeEffectLB + RB + LS + A + DOWN [D-PAD] Toggle Hide Weapon [HOLD LS + RS] Press Left on D-Pad Toggle Pan-Cam / Normal while Show Corrdinates is enabled. LB + RB + LS + A + UP [D-PAD] Toggle Show Coordinates / Camera ModeContributed By: Jay FNG Philbrook.

Unlockables

Complete each achievement to get the allotted gamerscore. These Are The NEW Halo 3 Updated Achievements, Now You Can Get 1750G From Halo 3, Provided You Have The Legendary Map Pack. UnlockableHow to UnlockAlas, Poor Yorick (25) On a Legendary map, get 3 Oddball melee kills during any ranked or social match. Assembly Skull (25) On Assembly, find the hidden skull. Awww Too Bad (25) On a Mythic map, get a Killjoy medal during any ranked or social match. Blades of Fury (25) On Heretic, get a Sword Spree during any ranked or social match. Came… From… Behind (50) On a Legendary map, get 3 assassinations during any ranked or social match. Citadel Skull (25) On Citadel, find the hidden skull. Defend This (50) On a Legendary map, get a flag melee kill during any ranked or social match. Delicious Brains (25) On a Mythic map, infect 2 humans during any ranked or social match. Double Double (25) On a Legendary map, get two Double Kills during any ranked or social match. Flag Dropped (25) On a Legendary map, get 2 flag carrier kills during any ranked or social match. Ghost Patrol (25) On Longshore, get 3 kills with a Ghost during any ranked or social match. Hammer Time (25) On Assembly, get 5 Hammer kills during any ranked or social match. Have Fun Respawning (25) On a Mythic map, get an Extermination during any ranked or social match. Heretic Skull (25) On Heretic, find the hidden skull. Killtacular (25) On a Mythic map, get a Killtacular during any ranked or social match. Logshore Skull (25) On Longshore, find the hidden skull. Look Both Ways (50) On a Legendary map, get a Splatter Spree during any ranked or social match. Orbital Skull (25) On Orbital, find the hidden skull. Post Mortem (25) On Orbital, get 2 Death From the Grave medals during any ranked or social match. Pull (25) On Citadel, get a Shotgun Spree during any ranked or social match. Road Rage (25) On a Legendary map, get 5 Warthog chaingun kills during any ranked or social match. Sandbox Skull (25) On Sandbox, find the hidden skull. Save This Film (25) On a Mythic map, get a Perfection medal during any ranked or social match. Tank Dropper (25) On any Mythic map, get a kill on another player while in monitor mode. Vidmaster Challenge: 7 on 7 (0) Enter into any ranked or social playlist with 7 EXP on the 7th of the month. Vidmaster Challenge: Annual (0) After 9/25/08, complete Halo on 4-player Legendary LIVE co-op, with Iron, and everyone in Ghosts. Vidmaster Challenge: Brainpan (25) Find all the hidden skulls on the Mythic maps. Vidmaster Challenge: Lightswitch (0) Get to the rank of Lieutenant in any playlist in the new EXP progression system. Zombie Repeller (25) On a Mythic map, kill 2 Zombies during any ranked or social match. … Get the Horns (25) On a Mythic map, get a Bulltrue medal during any ranked or social match.Contributed By: mastermanv5.

Secrets

Effect: Enemies do saving throwsWhere to find: Tsavo HighwayOn Tsavo Highway, about halfway through the mission (right after you are forced to walk through a large blue barrier), you will come out of a tunnel on the highway, and see a large pipeline on your left. Drop down in between the two, and run to the wall in front of you. Follow the wall all the way to where it connects with the cliff on your right, and turn to the left. There should be a few ledges--simply crouch jump from ledge to ledge, and the last one should have the "Tough Luck" skull on it.Contributed By: Mortal_Esteban.