Unlocking clubs, balls, and characters: 
All the clubs and balls can be unlocked by successfully completing the world tour on
difficulty level one (in options). You can also unlock only three of the characters in the
level. For each increase in level, you have the ability to unlock two more characters.
(i.e. by successfully completing world tour with the difficulty set at level four, you can
unlock a total of nine characters.

Hint: Quick bonuses:
Select world mode and begin game play in the final course. Play through hole 15 and
save the game if you are currently winning. Complete the rest of the course and win to
unlock another character and club. Reload the saved game and play holes 16, 17, and
18 again in first place to quickly unlock the next character and club.