Here are a few clues on how to unlock modes and weapons from “Call of Duty 4: Modern Warfare” on the Xbox 360.
Unlockable: Prestige Mode
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, which is the highest level, Prestige Mode allows you to start again from level one. This can be done a total of ten times, giving you ten different icons in in-game lobbies to show your extreme achievement.
Unlockable: 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 Challenge – that add extra re playability to the game.
Unlockable: New Mission
To play an all-new mission, which is an extra mission after the main quest is completed, beat the game and view the ending credits thereafter. After they’ve run their course, you will then be given the opportunity to play one last single player mission before all is said and done.
Unlockable: Multiplayer Weapons
To unlock the following weapons in multiplayer mode, reach the numbered rank listed.
Assault Rifle (G3) – Rank 25
Assault Rifle (G36C) – Rank 37
Assault Rifle (M14) – Rank 46
Assault Rifle (M4) – Rank 10
Assault Rifle (MP44) – Rank 52
LMG (M60E4) – Rank 19
Pistol (Desert Eagle) – Rank 43
Pistol (Golden Desert Eagle) – Rank 55
Pistol (M1911) – Rank 16
Shotgun (M1014) – Rank 31
SMG (AK-74U) – Rank 28
SMG (Mini Uzi) – Rank 13
SMG (P90) – Rank 40
Sniper Rifle (Barret) – Rank 49
Sniper Rifle (Dragunov) – Rank 22
Sniper Rifle (M40) – Rank 04
Sniper Rifle (R700) – Rank 34