Halo 3 Cheats For XBox 360
Fog Skull
Mission:The Floodgate
Result: "You’ll miss those eyes in the back of your head." Your motion sensor hides.
As you are walking down from the anti-air gun you demolished in last mission, you face a ramp (right next to the missile launcher). Target and smack the checkpoint around that ramp. Now, you should be able to listen marine yelling, “There! Over There!”.Now lLook up and to the right, straight at the roof of building next to the missle launcher. There is a single flood form (not to be mistaken with 2 other flood forms jumping right infront of you) which is holding skull. You have to finish him before he can jump, now get the skull which he will throw to the ground. If you do it quickly it will stuck on the roof, so you have to make sure you do it on right time..
The Famine Skull
Mission: Ark
Result: "Trust us. Bring a magazine." The weapons which are on floor or dropped are supposed to have very less ammunition e.g bullets compared to the normal.
Just after when the phantom is damaged and you enter into the valley , see on your left side, you should be able to see a big boulder. Go to the side of boulder by using ghost which is nearest to the bridge overhead. Use thurst to pilot ghost up to side of the wall. To achieve the skull, pilot 2 ghosts up the wall to the top of bridge & then stack them one on top of another right next to beam where the skull is located. Jump on to the beam from top of ghosts, make sure your direction is towards skull.
Tilt Skull
Mission: The Cortana
Result: "What used to be resistant is now immunity" Rivals have some body parts that may not get hurt certain bullet variants
While you are in circular shaped room with all the flood, locate and hop on top of a small structure piece next to the 2 archways, and up on rocks to the top left then turn left & jump up one more time and then do a 180 and jump over to the rocks across the side. When done successfully follow the the rock pointing out and leading up on top of of the real round shape room, skull should now be in blood.
Halo 3 Unlockable: Special Ending
To get the special ending unlocked you have to finish the game on the Legendary Mode successfully. Note: On legendary mode, its only the last stage which you have to defeat and complete successfully.
Halo 3 Unlockables
Achievements
Successfully finish the following achievements to get the corresponding score.
Unlockable
How to Unlock
Landfall (20)
Complete the first mission of Campaign on Heroic, Normal, or the Legendary mode.
Holdout (20)
Complete the 2nd mission of the Campaign on Heroic, Normal, or the Legendary mode.
The Road (20)
Complete 3rd mission of the Campaign on Heroic, Normal, or the Legendary.
Assault (30)
Complete 4th mission of the Campaign on Heroic, Normal or the Legendary mode.
Cleansing (30)
Complete 5th mission of the Campaign on Heroic, Normal, or the Legendary.
Refuge (30)
Complete 6th mission of the Campaign on Heroic, Normal, or the Legendary.
Last Stand (40)
Complete 7th mission of the Campaign on Heroic, Normal, or the Legendary.
The Key (40)
Complete the 8th mission of the Campaign on Heroic, Normal, or the Legendary.
Return (50)
Complete last mission of the Campaign on Heroic, Normal, or the Legendary.
Campaign Complete in: Normal (125)
Complete your Campaign on Normal.
Campaign Complete: Heroic (125)
Complete your Campaign on Heroic Note: normal is unlocked too.
Campaign Complete: Legendary (125)
Complete your Campaign on Legendary (heroic as well as normal are unlocked).
Iron (10)
Complete & claim this skull while playing on the Heroic, Normal, Legendary difficulty mode.
Black Eye (10)
Locate & claim this skull while playing on the Heroic, Normal or the Legendary difficulty mode.
Tough Luck (10)
Locate & claim this skull while playing on the Heroic, Normal or Legendary difficulty mode.
Catch (10)
Locate & claim this skull while playing on the Heroic, Normal or Legendary difficulty mode.
Fog (10)
Locate & claim this skull while playing on the Heroic, Normal or Legendary difficulty mode.
Famine (10)
Locate & get this skull while playing on the Heroic, Normal or Legendary difficulty mode.
Thunderstorm (10)
Locate & retrieve this skull while playing on the Heroic, Normal or Legendary difficulty mode.
Tilt (10)
Locate & retrieve this skull while playing on the Heroic, Normal or Legendary difficulty mode.
Mythic (10)
Locate & retrieve this skull while playing on the Heroic, Normal or Legendary difficulty mode.
Cavalier (10)
Achieve over 15,000 points in Campaign meta-game on 3rd mission.
Reclaimer (10)
Achieve over 15,000 points in Campaign meta-game on final mission.
Orpheus (10)
Achieve over 15,000 points in Campaign meta-game on 8th mission.
Vanguard (10)
Achieve over 15,000 points in Campaign meta-game on 7th mission.
Ranger (10)
Achieve over 15,000 points in Campaign meta-game on 6th mission.
Exterminator (10)
Achieve over 15,000 points in Campaign meta-game on 5th mission.
Askar (10)
Achieve over 15,000 points in Campaign meta-game on 4th mission.
Graduate (10)
Either complete ten games or earn the 5 EXP to finish requirements for normal training "Online".
UNSC Spartan (15)
To be known as True Spartan you have to acquire Sergeant Ratings "online".
Spartan Officer (25)
Advance to the Spartan Officer ranks (Online).
Two for One (5)
Score a Double Kill with a single spartan laser shot in a ranked free for all playlist (Online).
Too Close to the Sun (5)
Destroy an enemy banshee with the spartan laser or missile pod in a ranked playlist or in campaign.
Triple Kill (5)
Kill 3 enemies within 4 seconds of one another in a ranked free for all playlist (Online).
Overkill (5)
Kill 4 enemies within 4 seconds of one another in a ranked free for all playlist (Online).
Lee R Wilson Memorial (5)
Score 5 grenade sticks in any ranked free for all playlist (Online).
We’re in for Some Chop (5)
Destroy an enemy vehicle with equipment in a ranked playlist or in campaign.
Killing Frenzy (5)
Kill 10 enemies without dying in any ranked free for all playlist (Online).
Steppin' Razor (5)
Score a Triple Kill with the sword in a ranked free for all playlist (Online).
Mongoose Mowdown (5)
Splatter an enemy with the mongoose in a ranked free for all playlist (Online).
Up Close and Personal (5)
Kill 5 enemies by melee or assassination in a ranked free for all playlist (Online).
Fear the Pink Mist (5)
Kill 5 enemies with the needler in a ranked free for all playlist or in campaign.
Headshot Honcho (5)
Kill 10 enemies with headshots in a ranked free for all playlist or in campaign.
Used Car Salesman (5)
Destroy a vehicle that has three enemies in it in a ranked playlist or in campaign.
Marathon Man (40)
Locate and access all Terminals in the Campaign.
MVP (5)
Earn the MVP in any ranked playlist (Online).
Maybe Next Time Buddy (5)
Board the same vehicle within 10 seconds after being boarded in any free for all playlist (Online).
Guerilla (10)
Score over 15,000 points in the Campaign meta-game on the first mission.
Demon (10)
Score over 15,000 points in the Campaign meta-game on the second mission.
Armor Permutations Unlockables
Body Pieces: Spartan marked with (S) and Elite marked with (E).
Unlockable
How to Unlock
(S) EVA Body
Complete Tsavo Highway on Normal or higher
(S) EOD Body
Complete Tsavo Highway on Legendary
(S) Scout Body
Unlock "Too Close to the Sun" Achievement
(E) Flight Body
Complete Tsavo Highway On Herioic or Legendary
(E) Ascetic Body
Unlock "Up Close and Personal" Achievement
(E) Commando Body
Unlock "Triple Kill" Achievement
(S) EOD Shoulders
Complete The Ark on Legendary difficulty
(E) Commando Head
Unlock "Overkill" Achievment
(E) Commando Shoulders
Unlock "Killing Frenzy" Achievment
(E) Ascetic Head
Unlock "Steppin' Razor" Achievment
(E) Ascetic Shoulders
Unlock "Overkill" Achievment
(E) Flight Head
Complete Campaign mode on Heroic difficulty.
(E) Flight Shoulders
Complete The Ark on Heroic difficulty or higher.
(S) Mark V Head
Unlock "UNSC Spartan" Achievment
(S) ODST Head
Unlock "Spartan Graduate" Achievment
(S) Rogue Head
Unlock "Spartan Officer" Achievment
(S) Scout Head
Unlock "Used Car Salesman" Achievment
(S) EOD Head
Complete Campaign mode on Legendary Difficulty
(S) Security Shoulders
Earn 250 Gamerscore points.
(S) Security Head
Earn 1000 Gamerscore points.
(S) Scout Shoulders
Unlock "We're in for Some Chop" Achievment
(S) EVA Head
Complete Campaign mode on Normal
(S) EVA Shoulders
Complete The Ark on Normal difficulty or higher.
Halo 3 Unlockable: Silver Skull Locations
Blind
(Located: Sierra 117)
The arms of the player and the motion tracker disappear.
Grunt Birthday Party
(Located: Crow's Nest)
If you manage to get a headshot on a Grunt, the Grunt will explode.
Halo 3 Secrets
Grunt Birthday Party skull
Effect: Headshots cause enemies to explode.
Where to find: Crow's Nest
How to find: Right after the first objective, while en route to the barracks, you will fall down onto a pipe. At the end of this pipe, look over the edge to see a small space a few feet below you. You must simply drop over and as quicly as you can, pull back to land under the floor you were just on. After that, the skull will be at the end.
Black-Eye Skull
Effect: Melee hits instantly recharges your shield.
Where to find: Crow's Nest
How to find: As soon as you start the level, head straight up to the higher level. Head toward the door with the red light, then turn around. Jump onto the racks, onto the red metal light holders, then onto the ventilation tube. The skull will spawn at the end.
Blind Skull
Description: "Shoot from the hip"
Stage: First Stage
How To Find: When you get to the area where you see the Phantom overhead (one of the marines will point it out) jump over the rocks and keep following the path on the right. When you get to the cliff there will be a rock over of the side. The skull is on the end of the rock.
Note: This skull has to be Activated before you start a Campaign map.
Iron Skull
Effect: When either player dies in Co-Op on any difficulty both players will restart at last check point.
Where to Find: Spartan 117
How to find: In the area where you rescue Sarge, behind the prison cell is a large ledge. Got to the far right side and jump on the boxes, then onto the pipes to get up on the ledge, goto the far end of the ledge, turning two corners the skull is at the far end.
Tough Luck Skull
Effect: Enemies do saving throws
Where to find: Tsavo Highway
On 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.
Mythic Skull
Effect: Every enemy on the field now has double their normal amount of health.
Where to find: Halo
How to find: As soon as the mission starts walk up the hill in front of you and into the cave. Hug the right side of the cave and after a large boulder you will see a path on your right, just take the short path and it will be at the end.
Cowbell Skull
Effect: Explosive force increased (sputnik from H2)
Level: The Ark
Location: First pick up a grav lift from the small building near where you fight the scarab. Now proceed through the level until you reach the second sloping hallway (stairway), you should see some partitioned risers (platforms) halfway down. The skull is on the top level. Toss the grav-lift on the right side of the hall so it lands on the fourth little green dot from the door. Then run, jump, and use the grav-lift to propel you to the top. You should reach a ckeckpoint just as you enter the room so it you miss just try again.
Thunderstorm Skull
Mission: The Covenant
Effect: "Field promotions for everyone!" -- Upgrades enemies to their stronger versions.
After you shut down tower 1 and get access to the hornet, fly to tower 2 (the one the arbiter shut down). While walking up the stairs, go to the middle part that connects both and there should be a stair leading up to a platform where the skull is.
The 7 Terminals
The Ark:
1. Start the mission and once you enter the first building take a left into another door and now you should be in a curved corridor. On the inside is a Terminal.
2. After activating the bridge to let your comrades accross the gap, do a 180 and you should see it. (it does not open until you activate the bridge)
3. In the third building after defeating the scarab, kill the group of sleeping covenant, then follow the corridor downwards. Once you reach a door in front that is locked, immediately on the left there's an open door. Go through and walk straight off, then do a 180 to find a secret room. It is in there.
The Covenant:
1. When in the first tower standing on the lift, face the access panel and turn left. Jump over and it's right there.
2. Land your hornet on the second tower, walk towards the entrance but when you see the locked door, do a 180. Should be right in front of you.
3. When in the third tower standing on the lift, face the access panel and turn right. Jump over and it's right there.
Halo:
1. After reaching the end of the first cave, hug the right wall and you will see a building. Jump up onto the walkway and hang a left once inside. It's right there.
Catch Skull
Mission: The Storm
Effect: "Pull pin. Count to three. Throw." Every NPC carries two grenades and throws them often.
You can get this by performing a grenade jump off a warthog, or grab a ghost and go back to the ramp from which you first came out, using the ghost to push a big square crate back over to the front of the silo pod that the skull is on top of, then use the box as a place to jump from.
Fog Skull
Mission:The Floodgate
Result: "You’ll miss those eyes in the back of your head." Your motion sensor hides.
As you are walking down from the anti-air gun you demolished in last mission, you face a ramp (right next to the missile launcher). Target and smack the checkpoint around that ramp. Now, you should be able to listen marine yelling, “There! Over There!”.Now lLook up and to the right, straight at the roof of building next to the missle launcher. There is a single flood form (not to be mistaken with 2 other flood forms jumping right infront of you) which is holding skull. You have to finish him before he can jump, now get the skull which he will throw to the ground. If you do it quickly it will stuck on the roof, so you have to make sure you do it on right time..
The Famine Skull
Mission: Ark
Result: "Trust us. Bring a magazine." The weapons which are on floor or dropped are supposed to have very less ammunition e.g bullets compared to the normal.
Just after when the phantom is damaged and you enter into the valley , see on your left side, you should be able to see a big boulder. Go to the side of boulder by using ghost which is nearest to the bridge overhead. Use thurst to pilot ghost up to side of the wall. To achieve the skull, pilot 2 ghosts up the wall to the top of bridge & then stack them one on top of another right next to beam where the skull is located. Jump on to the beam from top of ghosts, make sure your direction is towards skull.
Tilt Skull
Mission: The Cortana
Result: "What used to be resistant is now immunity" Rivals have some body parts that may not get hurt certain bullet variants
While you are in circular shaped room with all the flood, locate and hop on top of a small structure piece next to the 2 archways, and up on rocks to the top left then turn left & jump up one more time and then do a 180 and jump over to the rocks across the side. When done successfully follow the the rock pointing out and leading up on top of of the real round shape room, skull should now be in blood.
Halo 3 Unlockable: Special Ending
To get the special ending unlocked you have to finish the game on the Legendary Mode successfully. Note: On legendary mode, its only the last stage which you have to defeat and complete successfully.
Halo 3 Unlockables
Achievements
Successfully finish the following achievements to get the corresponding score.
Unlockable
How to Unlock
Landfall (20)
Complete the first mission of Campaign on Heroic, Normal, or the Legendary mode.
Holdout (20)
Complete the 2nd mission of the Campaign on Heroic, Normal, or the Legendary mode.
The Road (20)
Complete 3rd mission of the Campaign on Heroic, Normal, or the Legendary.
Assault (30)
Complete 4th mission of the Campaign on Heroic, Normal or the Legendary mode.
Cleansing (30)
Complete 5th mission of the Campaign on Heroic, Normal, or the Legendary.
Refuge (30)
Complete 6th mission of the Campaign on Heroic, Normal, or the Legendary.
Last Stand (40)
Complete 7th mission of the Campaign on Heroic, Normal, or the Legendary.
The Key (40)
Complete the 8th mission of the Campaign on Heroic, Normal, or the Legendary.
Return (50)
Complete last mission of the Campaign on Heroic, Normal, or the Legendary.
Campaign Complete in: Normal (125)
Complete your Campaign on Normal.
Campaign Complete: Heroic (125)
Complete your Campaign on Heroic Note: normal is unlocked too.
Campaign Complete: Legendary (125)
Complete your Campaign on Legendary (heroic as well as normal are unlocked).
Iron (10)
Complete & claim this skull while playing on the Heroic, Normal, Legendary difficulty mode.
Black Eye (10)
Locate & claim this skull while playing on the Heroic, Normal or the Legendary difficulty mode.
Tough Luck (10)
Locate & claim this skull while playing on the Heroic, Normal or Legendary difficulty mode.
Catch (10)
Locate & claim this skull while playing on the Heroic, Normal or Legendary difficulty mode.
Fog (10)
Locate & claim this skull while playing on the Heroic, Normal or Legendary difficulty mode.
Famine (10)
Locate & get this skull while playing on the Heroic, Normal or Legendary difficulty mode.
Thunderstorm (10)
Locate & retrieve this skull while playing on the Heroic, Normal or Legendary difficulty mode.
Tilt (10)
Locate & retrieve this skull while playing on the Heroic, Normal or Legendary difficulty mode.
Mythic (10)
Locate & retrieve this skull while playing on the Heroic, Normal or Legendary difficulty mode.
Cavalier (10)
Achieve over 15,000 points in Campaign meta-game on 3rd mission.
Reclaimer (10)
Achieve over 15,000 points in Campaign meta-game on final mission.
Orpheus (10)
Achieve over 15,000 points in Campaign meta-game on 8th mission.
Vanguard (10)
Achieve over 15,000 points in Campaign meta-game on 7th mission.
Ranger (10)
Achieve over 15,000 points in Campaign meta-game on 6th mission.
Exterminator (10)
Achieve over 15,000 points in Campaign meta-game on 5th mission.
Askar (10)
Achieve over 15,000 points in Campaign meta-game on 4th mission.
Graduate (10)
Either complete ten games or earn the 5 EXP to finish requirements for normal training "Online".
UNSC Spartan (15)
To be known as True Spartan you have to acquire Sergeant Ratings "online".
Spartan Officer (25)
Advance to the Spartan Officer ranks (Online).
Two for One (5)
Score a Double Kill with a single spartan laser shot in a ranked free for all playlist (Online).
Too Close to the Sun (5)
Destroy an enemy banshee with the spartan laser or missile pod in a ranked playlist or in campaign.
Triple Kill (5)
Kill 3 enemies within 4 seconds of one another in a ranked free for all playlist (Online).
Overkill (5)
Kill 4 enemies within 4 seconds of one another in a ranked free for all playlist (Online).
Lee R Wilson Memorial (5)
Score 5 grenade sticks in any ranked free for all playlist (Online).
We’re in for Some Chop (5)
Destroy an enemy vehicle with equipment in a ranked playlist or in campaign.
Killing Frenzy (5)
Kill 10 enemies without dying in any ranked free for all playlist (Online).
Steppin' Razor (5)
Score a Triple Kill with the sword in a ranked free for all playlist (Online).
Mongoose Mowdown (5)
Splatter an enemy with the mongoose in a ranked free for all playlist (Online).
Up Close and Personal (5)
Kill 5 enemies by melee or assassination in a ranked free for all playlist (Online).
Fear the Pink Mist (5)
Kill 5 enemies with the needler in a ranked free for all playlist or in campaign.
Headshot Honcho (5)
Kill 10 enemies with headshots in a ranked free for all playlist or in campaign.
Used Car Salesman (5)
Destroy a vehicle that has three enemies in it in a ranked playlist or in campaign.
Marathon Man (40)
Locate and access all Terminals in the Campaign.
MVP (5)
Earn the MVP in any ranked playlist (Online).
Maybe Next Time Buddy (5)
Board the same vehicle within 10 seconds after being boarded in any free for all playlist (Online).
Guerilla (10)
Score over 15,000 points in the Campaign meta-game on the first mission.
Demon (10)
Score over 15,000 points in the Campaign meta-game on the second mission.
Armor Permutations Unlockables
Body Pieces: Spartan marked with (S) and Elite marked with (E).
Unlockable
How to Unlock
(S) EVA Body
Complete Tsavo Highway on Normal or higher
(S) EOD Body
Complete Tsavo Highway on Legendary
(S) Scout Body
Unlock "Too Close to the Sun" Achievement
(E) Flight Body
Complete Tsavo Highway On Herioic or Legendary
(E) Ascetic Body
Unlock "Up Close and Personal" Achievement
(E) Commando Body
Unlock "Triple Kill" Achievement
(S) EOD Shoulders
Complete The Ark on Legendary difficulty
(E) Commando Head
Unlock "Overkill" Achievment
(E) Commando Shoulders
Unlock "Killing Frenzy" Achievment
(E) Ascetic Head
Unlock "Steppin' Razor" Achievment
(E) Ascetic Shoulders
Unlock "Overkill" Achievment
(E) Flight Head
Complete Campaign mode on Heroic difficulty.
(E) Flight Shoulders
Complete The Ark on Heroic difficulty or higher.
(S) Mark V Head
Unlock "UNSC Spartan" Achievment
(S) ODST Head
Unlock "Spartan Graduate" Achievment
(S) Rogue Head
Unlock "Spartan Officer" Achievment
(S) Scout Head
Unlock "Used Car Salesman" Achievment
(S) EOD Head
Complete Campaign mode on Legendary Difficulty
(S) Security Shoulders
Earn 250 Gamerscore points.
(S) Security Head
Earn 1000 Gamerscore points.
(S) Scout Shoulders
Unlock "We're in for Some Chop" Achievment
(S) EVA Head
Complete Campaign mode on Normal
(S) EVA Shoulders
Complete The Ark on Normal difficulty or higher.
Halo 3 Unlockable: Silver Skull Locations
Blind
(Located: Sierra 117)
The arms of the player and the motion tracker disappear.
Grunt Birthday Party
(Located: Crow's Nest)
If you manage to get a headshot on a Grunt, the Grunt will explode.
Halo 3 Secrets
Grunt Birthday Party skull
Effect: Headshots cause enemies to explode.
Where to find: Crow's Nest
How to find: Right after the first objective, while en route to the barracks, you will fall down onto a pipe. At the end of this pipe, look over the edge to see a small space a few feet below you. You must simply drop over and as quicly as you can, pull back to land under the floor you were just on. After that, the skull will be at the end.
Black-Eye Skull
Effect: Melee hits instantly recharges your shield.
Where to find: Crow's Nest
How to find: As soon as you start the level, head straight up to the higher level. Head toward the door with the red light, then turn around. Jump onto the racks, onto the red metal light holders, then onto the ventilation tube. The skull will spawn at the end.
Blind Skull
Description: "Shoot from the hip"
Stage: First Stage
How To Find: When you get to the area where you see the Phantom overhead (one of the marines will point it out) jump over the rocks and keep following the path on the right. When you get to the cliff there will be a rock over of the side. The skull is on the end of the rock.
Note: This skull has to be Activated before you start a Campaign map.
Iron Skull
Effect: When either player dies in Co-Op on any difficulty both players will restart at last check point.
Where to Find: Spartan 117
How to find: In the area where you rescue Sarge, behind the prison cell is a large ledge. Got to the far right side and jump on the boxes, then onto the pipes to get up on the ledge, goto the far end of the ledge, turning two corners the skull is at the far end.
Tough Luck Skull
Effect: Enemies do saving throws
Where to find: Tsavo Highway
On 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.
Mythic Skull
Effect: Every enemy on the field now has double their normal amount of health.
Where to find: Halo
How to find: As soon as the mission starts walk up the hill in front of you and into the cave. Hug the right side of the cave and after a large boulder you will see a path on your right, just take the short path and it will be at the end.
Cowbell Skull
Effect: Explosive force increased (sputnik from H2)
Level: The Ark
Location: First pick up a grav lift from the small building near where you fight the scarab. Now proceed through the level until you reach the second sloping hallway (stairway), you should see some partitioned risers (platforms) halfway down. The skull is on the top level. Toss the grav-lift on the right side of the hall so it lands on the fourth little green dot from the door. Then run, jump, and use the grav-lift to propel you to the top. You should reach a ckeckpoint just as you enter the room so it you miss just try again.
Thunderstorm Skull
Mission: The Covenant
Effect: "Field promotions for everyone!" -- Upgrades enemies to their stronger versions.
After you shut down tower 1 and get access to the hornet, fly to tower 2 (the one the arbiter shut down). While walking up the stairs, go to the middle part that connects both and there should be a stair leading up to a platform where the skull is.
The 7 Terminals
The Ark:
1. Start the mission and once you enter the first building take a left into another door and now you should be in a curved corridor. On the inside is a Terminal.
2. After activating the bridge to let your comrades accross the gap, do a 180 and you should see it. (it does not open until you activate the bridge)
3. In the third building after defeating the scarab, kill the group of sleeping covenant, then follow the corridor downwards. Once you reach a door in front that is locked, immediately on the left there's an open door. Go through and walk straight off, then do a 180 to find a secret room. It is in there.
The Covenant:
1. When in the first tower standing on the lift, face the access panel and turn left. Jump over and it's right there.
2. Land your hornet on the second tower, walk towards the entrance but when you see the locked door, do a 180. Should be right in front of you.
3. When in the third tower standing on the lift, face the access panel and turn right. Jump over and it's right there.
Halo:
1. After reaching the end of the first cave, hug the right wall and you will see a building. Jump up onto the walkway and hang a left once inside. It's right there.
Catch Skull
Mission: The Storm
Effect: "Pull pin. Count to three. Throw." Every NPC carries two grenades and throws them often.
You can get this by performing a grenade jump off a warthog, or grab a ghost and go back to the ramp from which you first came out, using the ghost to push a big square crate back over to the front of the silo pod that the skull is on top of, then use the box as a place to jump from.