Mike Tyson Heavyweight Boxing Codes -

Unlock master code:
At the title screen (when the press start prompt appears), push , , , when PRESS START appears at the title screen.
 

Unlock all created boxer items:
At the title screen (when the press start prompt appears), push , , (x2), , when PRESS START appears at the title screen.
 

Unlock big heads:
At the title screen (when the press start prompt appears), push , , , when PRESS START appears at the title screen.
 

Unlock small heads:
At the title screen (when the press start prompt appears), push , , , when PRESS START appears at the title screen.
 

Unlock Random sized boxers:
At the title screen (when the press start prompt appears), push , , , when PRESS START appears at the title screen.
 

Unlock f lat mode:
At the title screen (when the press start prompt appears), push , , , when PRESS START appears at the title screen.
 

Unlock v iew full credits:
At the title screen (when the press start prompt appears), push , , , when PRESS START appears at the title screen.