Let you see different enemies from the game. You can rotate and scale them using the buttons.
You can choose to begin at any mission of the game. Remember that you can't play the third, fourth and fifth mission on the easy setting.
Now you can watch all the great movies of the game.
Listen to the sound effects and background music of the game. As well as the (I think) japanese voice effects of the game. Because at one point in the voice effect, the name of the two police officers are Ryo Kurotu and Marco Antneli which are the names of the two police officers in the japanese version.