Finish the singleplayer game to unlock a Museum bonus level. After you’ve done that go to the singleplayer missions and select the brand new Museum mission at the bottom. When you start this bonus level, be sure to get familiar with your new surroundings, grab two weapons and all the ammo you can carry, and then go to the entrance desk to ring the red bell. Once you press this “Don’t Press” button, 30 characters from the game (now enemies) will try to kill you. Kill two waves of them to beat this bonus level.
While in Multiplayer mode, check Tactical Nuke as a kill streak reward, then when you get a 25 kill streak you’ll receive a Tactical Nuke!
I wonder… what will you do with it? 👿
Marathon Ability: Unlimited sprint. Pro Ability: Get over obstacles faster. Unlock by running 26 Miles while using the Marathon perk.
Sleight of Hand Ability: Faster reloading. Pro Ability: Gives a speed boost to how fast you can aim down the sight of your weapon. Unlock by getting 120 kills while using the Sleight of Hand perk.
Scavenger Ability: Full resupply from dead enemies. Pro Ability: Extra magazines. Unlock by resupplying 100 times while using the Scavenger perk.
Bling Ability: 2 primary weapon attachments. Pro Ability: 2 secondary weapon attachments. Unlock by getting 200 kills while using a weapon with two attachments.
One Man Army Ability: Replaces your secondary weapon. This allows you to change your class at any given time during a match. Pro Ability: Swaps classes even faster.
Perk Class 2:
Stopping Power Ability: Increased bullet damage. Pro Ability: Increased bullet damage vs. helicopters and aircrafts. Unlock by getting 300 kills while using the Stopping Power perk.
Lightweight Ability: Move faster. Pro Ability: Allows you to do a quick aim after sprinting. Unlock by running 30 miles while using the Lightweight perk.
Hardline Ability: Killstreaks require 1 less kill. Pro Ability: Death streaks require 1 less death. Unlock by getting 40 kill streaks while using the Hardline perk.
Cold-Blooded Ability: Undetectable by UAV, air support, Sentry Guns, and thermal. Pro Ability: No red crosshair or name shown when you are targeted by UAV, air support, sentries or thermal imaging. Unlock by destroying 40 enemy kill streak rewards while using the Cold-Blooded perk.
Danger Close Ability: Increases explosive weapons damage. Pro Ability: Increases air support damage. Unlock by getting 100 kills with explosives while using the Danger Close perk.
Perk Class 3:
Commando Ability: Increased melee distance. Pro Ability: You don’t take any damage from falling. Unlock by getting 20 melee kills while using the Commando perk.
Steady Aim Ability: Increased hip-fire accuracy. Pro Ability: You can hold your breath for a longer period of time. Unlock by getting 80 hip fire kills while using the Steady Aim perk.
Scrambler Ability: Scrambles (jams) the enemy radar in a small radius. Pro Ability: Delays enemy Claymores, thus allowing you to avoid the explosion if you are fast enough. Unlock by getting 50 close range kills while using the Scrambler perk.
Ninja Ability: Invisible to heartbeat sensors. Pro Ability: Allows you to move silently. Unlock by getting 50 close range kills while using the Ninja perk.
SitRep Ability: Insertions. This will reveal enemy explosives and tactical insertions. Pro Ability: Makes enemy footsteps louder. Unlock by destroying 120 detected explosives or tactical insertions while using the SitRep perk.
Last Stand Ability: Allows you to survive a normal death. You will drop to the ground and pull out your pistol. You can crawl in Last Stand, which was not possible in Call of Duty 4. Last Stand ends after 10 seconds or if you get shot again, and in both cases, you will die. Pro Ability: This allows you to use your equipment too, for example, frag grenades and throwing knifes.
