Also known as: CoD 4
Call of Duty 4: Modern Warfare Hints
Perk Up
Your first perk slot is mostly reserved for extra explosives, or an attachment to one of your weapons like a silencer or red-dot sight. The standard soldier has one frag grenade and one flash, smoke or stun grenade. Tier one perks can give you three more of either, two charges of C4 or two RPG rockets. But unlocking those extra frags could take a while: they're not available until level 41.
Perk: Eavesdrop
Lets you listen in on what the enemy team is saying even when on they're on their private channel.
Perk: Bandolier
Allows you to carry more ammo.
Perk: Stopping power
By stopping, we mean killing. This perk pumps up the damage on all your firearms.
Perk: Juggernaught
Decreases damage taken, giving you extra time to close in on enemies and stab them for the kill.
Perk: Sleight of Hand
Reduces reloading time by half.
Perk: Double-tap
Unlocked at level 29 - weapon fires at twice the rate for a short time.
Perk: Overkill
Allows you to carry two primary weapons.
Perk: Sonic Boom
Increases damage of explosive weapons.
Perk: Extreme Conditioning
Increases length of sprints.
Perk: Last Stand
Continue firing after killed.
Perk: Martyrdom
Drop a grenade after killed.
Perk: Steady Aim
Increases accuracy of shooting when not looking through sights.
Perk: Deep Impact
Bullets penetrate deeper through cover.
Perk: Iron Lungs
Increases sprint length more than Extreme Conditioning.
Perk: Dead Silence
Obtained at level 44 - decreases sound when moving.
Submitted By: PC Gamer, GR
Multiplayer Challenges
Simply ranking up is enough to unlock the ordinary perks, but weapon modifications like laser sights, grenade launcher attachments and silencers are unlocked with specific challenges. Luckily these are pretty straightforward: want a sight for your M16? Get 50 kills with your M16. And better still, unlocking these gives you a bucket-load of XP towards your next promotion.
Submitted By: PC Gamer, GR