Cheat mode
At the main menu press Select, Right, Up, Down, Circle, Left, Square, Triangle, Circle to have the cheat options available.

Hints & Tips

One hit kill with the knife
When you are on level 1, when the man comes up, get your knife out. Now aim your knife at his head and throw it. This should kill him with no noise. Do what you wish to the other people. Remember to retrieve your knife.