While playing the game, hold L1 + R1 and press Square, Circle, Triangle, X(2) to display the "Cheat Entry" prompt. Then, enter one of the following codes to activate the corresponding cheat function. Note: Enabling a code will disable saving.

Full health

Press Triangle, Square(2), Triangle, X, Circle at the "Cheat Entry" screen.

Full ammunition

Press Circle(2), Triangle, Square, X, Triangle at the "Cheat Entry" screen.

In the final part of the Der Flakturm mission, when you have to escape through the sewer, you will encounter approximately six of the hard to kill elite machine gun soldiers. It is very hard to defeat them all. It is much easier to run past them all. Make sure you have at least three health bars. Once you climb the ladder, the game is basically over.