Assault Plus (Hidden Game)  Go right and up the stairs from the info. booth.  Turn left, enter X-Room, press and hold L1+R1+L2+R2+Up at the same time.  Then, press Triangle, while holding the other buttons.  You'll hear a confirmation sound.  Stand in front of the woman and press X.

New Intro  When the Namco logo appears and the game is loading, press and hold L1+R1. (Thanks to JimGe17077@aol.com)

Return Of Ishtar (Alternate Version)  In the Return of Ishtar room, press >, <, Up, Down, Circle.