Mario Golf cheats and cheat codes for Gamecube

Cheat codes:
Hold Z and press Start at the title screen, to unlock the "Special Contests" 
selection at the main menu. Go to the "Password Tournament" screen and enter 
the following cheat codes.

Bowser Badlands Tournament: Enter "9L3L9KHR as a password.
Bowser Jr.'s Jumbo Tournament: Enter "2GPL67PN as a password.
Hollywood Video Tournament: Enter "BJGQBULZ" as a password.
Mario Open Tournament: Enter "GGAA241H" as a password.
Peach's Invitational Tournament: Enter "ELBUT3PX as a password.
Target Bullseye Tournament: Enter "CEUFPXJ1" as a password.
Camp Hyrule Tournament: Enter "0EKW5G7U" as a password. 
Note: First letter is the number zero.

Hidden Hole in one contest
Go to "Special Contests" menu to select  hole in one contest.


Unlock Sands Classic Tournament
Finish the Cheep Cheep Tournament with any golfer

Unlock Cheep Cheep Tournament
Finish the Lakitu Cup Tournament with any golfer

Unlock Blooper Open Tournament
Win 1st place in the Sands Classic Tournament with any golfer

Unlock Star Tournament
Win 1st place in the Bowser Badlands Tournament with any golfer

Unlock Peach Invitational Tournament
Win 1st place in the Blooper Open Tournament with any golfer

Unlock Bowser Badlands Tournament
Win 1st place in the Peach Invitational Tournament with any golfer

Unlock Back 9 holes in Birdie Challenge
Finish the front 9 holes in Birdie Challenge

Unlock intermediate and expert modes in Side Games
Finish novice mode in any Side Game then complete the unlocked 
intermediate mode


Unlockable golfers:

Boo: 
Get 50 birdie badges

Shadow Mario:
Finish Ring mode

Petey Pirahna:
Finish the putting, approach, and shot training in the Side Games 
in all 3 difficulty modes 

Bowser Jr:
Play the 18 Hole Birdie Challenge in the Side Games.
Get a Birdie or better on all 18 holes