Master code:
Press Square, Circle, L2, R2 when "Press Start" appears at the title screen.

All created boxer items:
Press L1, R1, X(2), Triangle, X when "Press Start" appears at the title screen.

Big heads:
Press Square, Circle, Up, Down when "Press Start" appears at the title screen.

Small heads:
Press Square, Circle, Down, Up when "Press Start" appears at the title screen.

Random sized boxers:
Press Square, Left, Up, Triangle when "Press Start" appears at the title screen.

Flat mode:
Press Down, Up, Circle, Square when "Press Start" appears at the title screen.

View full credits:
Press X, Triangle, Square, Circle when "Press Start" appears at the title screen.

All boxers:
Win the Bronze, Silver, and Gold belts.

Mike Tyson Challenge:
Defeat Mike Tyson and win the Gold belt to unlock the undisputed champ mode..

Fight as Mike Tyson:
Win the Gold Belt to unlock Mike Tyson in single player mode.

Fight as Iron Mike:
Win the Mike Tyson Challenge to unlock Iron Mike, the early version of Mike Tyson.

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