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Playstation 2 - Resident Evil 4 cheats

Get PRL 412 laser weapon with infinite ammo:
Complete Leon's Story on Professional mode

Buy Thompson Gun in new game+:
Complete Leon's story mode on any mode and complete Ada's story 
mode (Separate Ways). Buy it from the Roma merchant.

Ada can also have own weapon. Complete Assignment Ada Mission, after
speak again with the Roma merchant to access it.

Unlockable Modes and Clothes
Finish the main game on any difficulty mode to unlock: 
Professional Difficulty level
Mercenaries Challenge 
Separate Ways Mini-Campaign 
Different clothes for Ashley, Leon and Ada Wong 

Unlockable PS2 Costumes for Leon and Ashley:
Complete the Separate Ways mode