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XBox - Mike Tyson Heavyweight Boxing cheats

Unlock everything - All arenas, boxers, game modes available:
When you see "Press Start" at the title screen, press X, B, L, R
buttons on your controller controller to get access to all arenas,
boxers and modes.

Giant heads:
When you see "Press Start" at the title screen, press X, B, Up, Down.
buttons on your controller controller to enable the big head mode.

Tiny heads:
When you see "Press Start" at the title screen, press X, B, Down, Up.
buttons on your controller controller to enable the small head mode.

Unlock Flat mode
At the "Press Start" screen, press 
When you see "Press Start" at the title screen, press Down, Up, B, X.
buttons on your controller controller to enable the flat mode.

Random sized boxers: Press X, Left, Up, ?

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

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

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