This game is also available on PS3.
Retro Game Cheats for Mercenaries 2: World in Flames (Xbox 360)
Effect: Unlockable Costumes
When:
During the game
How:
complete level 3 of a weapon challenge, this can be done by talking to Fiona at your PMC, Each time you complete a level 3 weapon challenge you will receive one of three costumes.
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Effect: Invincibility (not during a mission)
When:
Head past a boundary, but before you die enter the code. The screen should stop fuzzing and look normal. You will then be invincible to everything apart from heavy explosive attacks.
How:
X, LB, A, Y, Left, Right, B, A, X, LB, RT, Left, Right,X, LT, LB, X
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Effect: Invincibility
When:
On the PDA screen once the cheat mode has been activated (LB RB RB LB RB LB LB RB RB RB LB THEN PRESS BACK, THEN GO BACK TO THE PDA SCREEN TO ENTER)
How:
UP DOWN LEFT DOWN RIGHT RIGHT
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Effect: Nuclear Bomb
When:
On the PDA screen once the cheat mode has been activated (LB RB RB LB RB LB LB RB RB RB LB THEN PRESS BACK, THEN GO BACK TO THE PDA SCREEN TO ENTER)
How:
UP UP DOWN DOWN LEFT RIGHT LEFT RIGHT
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Effect: Unlimited health
When:
During the game on the map screen
How:
Left Bumper, Right Bumper, Right Bumper, Left Bumper, Right Bumper, Left Bumper, Left Bumper, Right Bumper, Right Bumper, Right Bumper, Left Bumper. (If you have allready done this you will not need to do it again) then on the d-pad press Up, Down, Left, Down, Right, Right and you should hear a beep when you close the map.
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Effect: Enables Cheat Mode, You can no longer gain achievements for that save file.