At the main menu, hold L1 + R1 and press Square, Up, Down, Circle to unlock all chapters at the chapter selection screen.
Successfully complete the game, then return to the main menu. Hold L1 + R1 and press Circle, Square, Down, Left at the main menu. You can now play as a roast duck. Alternately, enable the "Chapter select" code. Choose Chapter 63 at the chapter selection screen. Complete that chapter to finish the game, then enable the code.
Successfully complete the game to unlock Jet Li's Once Upon A Time In China and Fist Of Legend costumes.
Successfully complete the game to unlock the Young Michelle and Young Kit Yun FMV sequences.
Successfully complete the game on the normal difficulty setting to unlock the hard difficulty setting.
Hold the Left Analog-stick in any direction after you finish a combo. Jet Li will strike a pose and your bar will increase.
At the beginning of the third stage where you have to use guns, do not use the special diving until you get to a truck where there are a lot of barrels up ahead. There is a pile of dirt behind the truck. Run to the top of the dirt and bust up the special diving move. You will see Jet Li perform a high diving move.
Go slightly into the level. Eventually you will end up behind two of the security guards standing next to each other. Before killing them, sneak up behind them and listen. The one on the left will be talking about his son, and how he wants the Jet Li Rise To Honor game. Note: In order to kill the two guards, you must throw the trash can at the one on the left, then quickly chop the other so that he will not call for back-up.
There are going to be three stages during the final Boss battle. During the first stage, counter every move that he makes and eventually you will defeat him. In the second stage, you must go up to him. This is easiest when he is turned around. Then, press R1 + Left Analog-stick Forward to grab his gas mask. Eventually he will give up. In the third and final stage you must first counter him and knock him down. Then, before he gets up, keep attacking him using L1 as much as possible, before he has a chance to stand up and block your moves. You must keep fighting before he stands to block you. Try to trap him in the far right corner of the balcony, as this is slightly easier.
Some of the guards in the hospital rooms can be big and strong, yet quick and fast. The easiest way to take them out is to do a counter (R1 +L1 + Right Analog-stick) immediately followed buy dunking their head in the sink via Grab.