Multiplayer Weapons Each weapon is unlocked in multiplayer at a certain rank.
Unlockable: | How to Unlock: | Assault Rifle - G3 | Reach Rank 25 | Assault Rifle - G36C | Reach Rank 37 | Assault Rifle - M14 | Reach Rank 46 | Assault Rifle - M4 Carbine | Reach Rank 10 | Assault Rifle - MP44 | Reach Rank 52 | Humiliation Challenges | get rank 42 | Humiliation Challenges 2 | get rank 45 | Humiliation Challenges 3 | get rank 47 | Humiliation Challenges 4 | get rank 48 | Humiliation Challenges 5 | get rank 50 | Iron Lungs Perk Class 3 | get rank 26 | Killer Challenges | get rank 30 | Killer Challenges 2 | get rank 33 | Killer Challenges 3 | get rank 36 | Killer Challenges 4 | get rank 39 | Last Stand Perk Class 3 | Get rank 07 | LMG - M60E4 | Reach Rank 19 | M1911 Pistol | Get rank 15 | M4 Carbine Assault Rifle | Get rank 09 | M40 Sniper Rifle | Get rank 06 | M60E4 Light Machine Gun | Get rank 18 | Martyrdom Perk Class 2 | Get rank 16 | Mini Uzi Submachine Gun | Get rank 12 | New playlists | Get rank 05 | Operations Challenges | Get rank 20 | Operations Challenges | get rank 21 | Operations Challenges 2 | get rank 24 | Operations Challenges 3 | get rank 27 | Overkill Perk Class 2 | get rank 38 | Pistol - Desert Eagle | Reach Rank 43 | Pistol - Golden Desert Eagle | Reach Rank 55 | Pistol - M1911 | Reach Rank 16 | Shotgun - M1014 | Reach Rank 31 | Sleight of Hand Perk Class 2 | Get rank 19 | SMG - AK-74U | Reach Rank 28 | SMG - Mini Uzi | Reach Rank 13 | SMG - P90 | Reach Rank 40 | Sniper Class Weapon Class | Get rank 02 | Sniper Rifle - Barret | Reach Rank 49 | Sniper Rifle - Dragunov | Reach Rank 22 | Sniper Rifle - M40 | Reach Rank 04 | Sniper Rifle - R700 | Reach Rank 34 | UAV Jammer Perk Class 2 | Get rank 10 |
Epilogue mission Successfully complete the game and watch the entire credits to unlock the bonus Epilogue mission.
Prestige mode Reach level 55 to unlock Prestige mode. This is a multiplayer-only mode that starts you again at level 1. You can repeat this ten more times.
Cheat options Collect the Intel Pieces (enemy laptop computers) hidden throughout the game to unlock the cheat options. The number of pieces you have determines which specific cheats are available.
Unlockable: | How to Unlock: | A Bad Year | 15 Intel Pieces. Enemies explode into tires when shot. | Cluster Bombs | 10 Intel Pieces. When a frag grenade explodes, four more will explode in a cross-shaped pattern. | CoD Noir | 2 Intel Pieces. Allows black and white graphics. | Infinite Ammo | 30 Intel Pieces. Reloads are no longer necessary. This has no effect with single-shot weapons such as RPGs, C4, or Claymores. | Photo-Negative | 4 Intel Pieces. Inverts the colors. | Ragtime Warfare | 8 Intel Pieces. Silent movie mode. | Slow-Mo Ability | 20 Intel Pieces. The game slows to half speed when you melee. | Super Contrast | 6 Intel Pieces. Increases the contrast. |
Sniping If a target is moving make sure to lead it. If you are not making shots try to lead your target more. Also, if you are a skilled sniper try using the M40A3 over the M21. It has a slower reload time and rate of fire, but it has enough damage to kill a target in one shot instead of two or three. It also allows you to be less noticeable with less rounds being fired; so someone else cannot follow the tracer shot back to you. A good setup for the sniper is the Claymore perk, to alert you when an enemy is trying to close in on your rear, and either the Sleight Of Hand or Stopping Power, then Iron Lungs to give you more time to line up your shots.
Game Over: SSgt. Griggs's "Success!" comment Killing all three RPG enemies in the pursuing trucks in Game Over results in SSgt. Griggs saying "Success!"
Multi-player: Headshots When you kill another player with a headshot, a metal "ping" sound will play to confirm it.
Golden Weapons Golden weapons are a special camo that you get when you fully complete their respective weapon challenges.You can access them by choosing the camo of the respective weapon.The weapons don't get a boost or anything alike,it's purely cosmetic.
Unlockable: | How to Unlock: | Golden Ak-47 | Complete all Assault Rifle challenges. | Golden Desert Eagle | Get to Lv.55. | Golden Dragonuv | Complete all Sniper challenges. | Golden M1014 | Complete all Shotgun challenges. | Golden M60 | Complete all LMG challenges. | Golden Mini-Uzi | Complete all SMG challenges. |
Crew Expendable: Desert Eagle In the second large containment room, run ahead of your team. There are two enemies with Desert Eagles who will try to surprise you around two corners, depending on the path you take.
Better accuracy Once you get the Red Dot Scope addon to your weapons, use it over the ACOG scope. The red dot will not enhance or take away anything and provides a better aimpoint on most weapons. The ACOG scope will actually add more range to your weapon, but take away accuracy which accomplishes almost nothing; especially so for snipers because it takes away range and adds nothing.
Intel Pieces The Intel Pieces can be found in the following levels. There are a total of thirty Intel Pieces.
Level 2: 2 Intel Pieces Level 4: 2 Intel Pieces Level 5: 3 Intel Pieces Level 6: 2 Intel Pieces Level 7: 2 Intel Pieces Level 9: 3 Intel Pieces Level 10: 2 Intel Pieces Level 12: 2 Intel Pieces Level 13: 3 Intel Pieces Level 14: 2 Intel Pieces Level 16: 2 Intel Pieces Level 17: 1 Intel Piece Level 18: 2 Intel Pieces Level 19: 2 Intel Pieces
Mile High Club mission Complete Story mode under any difficulty setting.
Cheat mode Successfully complete the game. A "Cheat" option will now appear during game play at the "Options" menu.
Arcade mode Successfully complete the game.
Faster experience To level up quicker than usual, try to use the same gun until all the marksman and elite challenges are completed. They provide huge boosts and will quickly level you up to get new guns. However, do not use those guns yet. Just keep on the challenge until it has completed. The third phase of the challenge usually ends with 1,000 experience points and that will bump you up a rank almost in itself. Also, do not forget about the strange challenges like jumping 15 feet and surviving or falling 30 feet to your death. To get that one if not previously unlocked play the "Countdown" map and jump into one of the open missile silos. You will get instant experience points for simply dying. Also, remember to go prone and crouch to get those challenges as well.
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