Hitman 2 - Silent Assassin - Platform: Playstation 2
    
Level select:
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At the main menu, press R2, L2, Up, Down, Square, Triangle, Circle. 
Enter these codes while playing, without pressing pause:

Level Complete  R2, L2, Up, Down, X, L3, Circle, X, Circle, X 
MIssion Select  R2, L2, Up, Down, Square, Triangle, Circle  
Gravity         R2, L2, Up, Down, X, L2, L2  
Lethal Charge   R2, L2, Up, Down, X, R1, R1  
Punch Mode      R2, L2, Up, Down, X, Up, Up  
Full Health     R2, L2, Up, Down, X, Up, Down  
Bomb Mode       R2, L2, Up, Down, X, Up, L1  
SloMo Mode      R2, L2, Up, Down, X, Up, L2  
Megaforce       R2, L2, Up, Down, X, R2, R2  
Nailgun Mode    R2, L2, Up, Down, X, L1, L1

Silenced Silverballers .45
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To get the Silenced Silverballers you have to get a Silent 
Assasin  rank when you beat a mission.