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 [...]

Here’s a few Grand Theft Auto 4 Cheat Codes for the Xbox 360. Please remember that you must enter these cheats during gameplay with Niko Bellic’s automobile.
1: To give Niko an Armer dial 3625550100.
2: If you want to restore Niko’s Health use this 4825550100
3: For weapons #1 Handgun, Shotgun, MP5, M4, Sniper Rifle, RPG, Grenades, Baseball bat, use 4865550100 this number translates into GUN-555-0100.
4: To remove wanted level (Blocks “Walked free” achievement): 2675550100
5: Raise Wanted Level (Adds a star to Niko’s wanted level): 2675550150, number shall translate into “COP-555-0150″.
6: If you want to change weather or brightness 4685550100, number shall translate into “HOT-555-0100″.
7: Spawn Annihilator: 3595550100, phone number shall translate [...]

- Cheat mode
At the main menu, choose the “Options” selection, then select the “Enter Code” option. Then, enter one of the following codes to activate the corresponding cheat function:
- Play as Kota
- Enter “MANDALORE” as a code to unlock Kota.
- Apprentice’s father’s costume
- Enter “WOOKIEE” as a code to unlock the Apprentice’s father’s costume.
- Apprentice’s hooded costume
- Enter “HOLOCRON” as a code to unlock the Apprentice’s hooded costume.
- Clone trooper helmet in TIE Fighter factory
When you reach the point in the factory where the TIE Fighters attack you, there are metal beams you can bend. Bend the last one backward, and make it a [...]

To unlock fulfill all requirements listed.
- Algol - Complete Story Mode and defeat Algol to unlock him as a playable character.
- Amy - Can be purchased for 4,000 Gold in Character Creation.
- Angol Fear - Defeat Angol Fear in Story Mode to unlocker her as a playable character. She appears as a variation of “Bonus Character” on the character select screen.
- The Apprentice - Complete Arcade Mode with Darth Vader or Yoda to unlock The Apprentice as a playable character.
- Ashlotte - Defeat Ashlotte in Story Mode to unlocker her as a playable character. She appears as a variation of “Bonus Character” on the character select screen.
- Cervantes - Can [...]

Check out these very advanced tricks for “Halo 2″ provided by Overswarm. These are pretty advanced, but awesome!
[youtube VzhRXDBEzAA]

This is the unofficial “Gears of War” sniper guide created by Detonati & Dibble155.
[youtube ERDtbmW7DC8]