Unlock All Characters :
At the main menu press in the following order: L2, R2, L2, R2, Up, Right, Down, Left, L1, R1. Now all characters will be unlocked for stroke play.

Left-handed golfers:
Highlight a golfer, then hold L2 + Select and press X at the character selection screen.

Alternate sounds (Japanese version):
Press L1, R1, L2, R2, L1, R1, L2, R2 at the main menu. A sound will confirm correct code entry. Repeat the code to select various sound selections.