Call of Duty 4: Modern Warfare
Complete the indicated task to unlock the given item.
Beat the game on any difficulty and let the credits run all the way through. When they finish, you'll start another mission. This mission takes place on a plane the resembles Air Force One, wherein you must fight your way through a hoard of baddies, save the V.I.P. and escape the plane in less than 2 minutes. Also, when you finish the game, you unlock the Arcade Mode.
To unlock Arcade Mode, beat the game once through on any difficulty level. Arcade Mode itself is split into two options - Full Challenge or Level Chal
Collect All Intel Pieces
Cheats are unlocked not by inserting passwords, but by acquiring the thirty Intel Pieces strewn throughout the game. The more of them you collect, the more cheats you can access. On the left are the number of Intel Pieces collected, and on the right are the cheats that are unlocked, with an explanation of what each does
To unlock Prestige Mode, which is a multiplayer-only mode, you must reach experience level fifty-five. Instead of capping out at level fifty-five.
Unlockable multiplayer weapons are based on your rank you receive. As you gain in rank, you will gain the ability for more and more weapons.
All these perks are obtained by a certain rank in multiplayer mode.
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