Change your name to PLAYA (case-sensitive) in the status menu.
Change your name to DAMAX (case-sensitive) in the status menu.
Change your name to XTRA0 (case-sensitive) in the status menu.
Change your name to XTRA2 (case-sensitive) in the status menu.
Change your name to XTRA1 (case-sensitive) in the status menu.
Deleted Saved Games
Change your name to ERAZE (case-sensitive) in the status menu.
Custom Character Appearance
Successfully complete the game to unlock the Kasutamu Kaozura item for purchase for $9,000. It will allow your character's appearance to be customized.
Repeatedly run into a wall to increase your reputation by one point each time.
To face a boss, you must first defeat all gang members from each turf at least once before entering a Boss' turf. Also, you must defeat the bosses in the order below to enter Reihou High School. Sawaguchi: Hanazo Second District (just before the second shopping arcade), and again at Marukaunsou Haisoko Higashiguchi (back gate of the warehouse after defeating Nishimura).
Kamijou and Yamamoto: Below Shintakaragawa (below the bridge after the 2nd town)
& again at the sauna (after defeating Nishimura, Mochizuki, and Taira).
Nishimura: Marukaunsou Haisouko (inside the warehouse)
Mochizuki: Marukaunsou Haibiru Shoumenguchi (outside the tunnel)
Taira: Midorimachi Third District (just before the third shopping arcade)
Kinoshita: Hanazo Park (after defeating Taira)
Kobayashi: Kobayashi Sangyo Kojou (inside the factory, after defeating Kinoshita)
Kunio or Riki (only when playing a solo game): Kobayashi Sangyo Kojou Uradeguchi (back of the factory, just before the last shopping arcade)
Himada: Yumemichou Second District (after the sauna)
Gouda: Outside Reihou High School
Onizuka: Reihou School Gym
Gotai: Reihou Classroom Third Floor
Ryouichi and Ryouji (Billy and Jimmy Lee: The Double Dragon Twins): Reihou
Classroom Top Floor
Yamada: Reihou Classroom Rooftop
Start with bonuses
In the status menu, change your name to WAZZA, FUZZY, WUZZY or BEAR (case-sensitive).