Code for panel in library:-  In the library is a panel on the second floor the code is 3926.

Skip events  -  Repeatedly press Action to skip past events during game play.

Missing one armed man  -  In the beginning. go to the left. After awhile, you will see a building. Enter it, and a man with one
arm missing will be sitting inside. Talk to him and get the key from him. Go back out and keep going.  After you start walking a short distance, you will hear gunshots. Turn around and go back in the building. The man will be missing.

Gameshark codes

(M) Must Be On ECBA526C1456E60A 
Beacon Carnby 4C3B74F01456E7A6 
Can't Turn Torch Off 4C2B36AC1456E7A6 
Carnby Ready To Run 4C2C00841456E79D 
Cyborg Eyes Carnby 4C0060301456E7A6 
Inf Revolver ammo 4C2B38A41456E7B7   4C2B3BE41456E7B7 
Infinite Health 4C2B36B41456E781   4C2B39F41456E781