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Upgraded Battalions
Insert the passwords listed below on the left at the in-game cheats menu to unlock upgraded versions of the battalions listed on the right.
EUCA20 - European Federation
JSFA35 - Joint Strike Force
SPZT17 - Spetznaz

Authentic Difficulty
To unlock Authentic Difficulty, beat the game on any other difficulty setting.
All Reconnaissance Reports
To automatically unlock all reconnaissance reports in the game, insert the following code at the in-game cheats menu: 0ZNDRBICRA.

Unlock Characters

To unlock the characters listed below, fulfill the requirement(s) listed.

Big Boss (on Extreme), 69/69 weapons, all costume and camos (except Corpse camo), all items including stealth and bandana (except scanning plug), all face camo, almost all iPod songs (missing 5), 4800000DP+.

Restart A Dead Car
If your car gets horribly damaged and stalls or refuses to start, call 911 on your cell phone. When they pick up, hang up your phone, and your car should start once more!

Grand Theft Auto 4 savegame for playstation 3

100% all characters and parcels found and bought. All levels, artifacts, true Adventurers Obtained. Max studs (4,000,000,000).

Insert the following codes at the in-game cheats menu for the desired result.
All Multiplayer Characters - Left, Down, Left, Right, Down
Big Head Mode (Story Mode) - Down, Up, Left, Right, Right
Infinite Chi - Down, Right, Left, Up, Down
Invulnerability - Down, Down, Right, Up, Left
Dragon Warrior Outfit (Multiplayer Mode) - Left, Down, Right, Left, Up

Unlockable: Characters

To unlock the characters listed below, head to the math classroom at the university and insert the corresponding password for the character desired.

(Unique) Stunt Jumps Guide v1.0.
Download
Grand Theft Auto 4 - (UNIQUE) STUNT JUMPS GUIDE