How do you use cheats on Mercenaries 2?

Answer 1

Here is a list of some (I think all) of the cheat codes in the game along with a warning.

If you enable cheat mode YOU WILL NOT BE ABLE to unlock and more achievements ON THAT ONE file.


To turn cheat mode on: open up your PDA (back button) and then enter the following:
LB RB RB LB RB LB LB RB RB RB LB
And then close your PDA (back button).
To enter codes after it is enabled open up your PDA (back button) and then enter the code and close your PDA (back button).

Invincibility - Up Down Left Down Right Right (one of my favs)


Infinite Ammo - Up Down Left Right Left Left (my fav cheat)

Give All Vehicles - Up Down Left Right Right Left


Give All Supplies - Left Right Right Left Up Up Left Up


Give All Airstrikes (except nuke) - Right Left Down Up Right Left Down Up

Give Nuke - Up Up Down Down Left Right Left Right

Fill Fuel - Up Up Up Down Down Down

Unlock All Costumes - Up Right Down Left Up

Unlock Grapping Hook - Up Left Down Right Up

BTW you need to have your version updated first.

Enjoy!!

Answer 2

Cheats are only available after the October 31, 2008 online update is applied to your game. While playing the game, activate the PDA, and press LB, RB(2), LB, RB, LB(2), RB(3), LB to enable cheat mode. Then, close the PDA. If you entered the code correctly, a message will appear. Activate the PDA again, and enter one of the following codes at the PDA screen to activate the corresponding cheat function. Note: Achievements are permanently disabled for the current save/profile when cheats are activated. Invincibility

At the PDA screen, press Up, Down, Left, Down, Right(2). This code will affect both players if enabled in Co-op mode.

Infinite ammunition

At the PDA screen, press Up, Down, Left, Right, Left(2).

Refill fuel

At the PDA screen, press Up(3), Down(3).

All vehicles

At the PDA screen, press Up, Down, Left, Right(2), Left to unlock all vehicles.

All supplies

At the PDA screen, press Left, Right(2), Left, Up(2), Left, Up to unlock all supplies.

All costumes

At the PDA screen, press Up, Right, Down, Left, Up to unlock all costumes.

All airstrikes except Nuke

At the PDA screen, press Right, Left, Down, Up, Right, Left, Down, Up to unlock all airstrikes except the Nuke.

Nuke

At the PDA screen, press Up(2), Down(2), Left, Right, Left, Right to unlock the Nuke.

Grappling hook

At the PDA screen, press Up, Left, Down, Right, Up to unlock the grappling hook. This code will affect both players if enabled in Co-op mode.