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Playstation 2 - Mike Tyson Heavyweight Boxing cheats

When you see "Press Start" at the title screen, press the following
button combination cheats:

Master code: Press Square, Circle, L2, R2 
All created boxer items: Press L1, R1, X, X, Triangle, X 
Giant heads: Press Square, Circle, Up, Down
Dwarf heads: Press Square, Circle, Down, Up
Random sized boxers: Press Square, Left, Up, Triangle
Flat mode: Press Down, Up, Circle, Square
View credits: Press X, Triangle, Square, Circle

Unlock all boxers: 
Win the Bronze, Silver, and Gold belts also.

Unloc Mike Tyson Challenge:
Beat Mike Tyson and win the Gold belt

Unlock Mike Tyson:
Win the Gold Belt

Unlock Iron Mike:
Win 1st place in the Mike Tyson Challenge