Password screen:
Press Circle at the course selection screen.

Summerlin course:
Press Circle on the course selection screen, then enter the password PORASO.

Unlock all of the courses:
Press Circle on the course selection screen, then enter the password POQAKI

Cyber Badlands Course:
Press Circle on the course selection screen, then enter the password HARESO.

Cyber Sawgrass Course:
Press Circle on the course selection screen, then enter the password SECARE.

Canyons course:
Press Circle on the course selection screen, then enter the password NAMOPI.

Play as Martian:
Enter Ufo as the name of your golfer at the edit name screen.

Unlock The Volcano Course:
Enter Sthelens as the name of your golfer at the edit name screen.

New golfers:
On the name edit screen type in the names seperately "Brat", "Willie", and "Retro" to get three more new golfers!

Unlock the Forged Irons:
You will unlock the forged irons after you shoot an eagle on any hole.