Hole in One Contest 
     Hold  Z  and  press start at the title screen to reveal ''Special
Contests'' on the main menu. You will find it there.

Target Tour Tournament 
     Hold Z and press START at the title screen and a new option comes
up.Go to password tournament. Then enter CEUFPXJ1 as the password.

Unlock "Cheep Cheep Tournament" Course 
     Complete  the Lakitu Classic with any character to unlock the new
course, Cheep Cheep Tournament.

Unlock "Sands Classic" Course 
     Complete  the Cheep Cheep Tournament with any character to unlock
the new course, Sands Classic.

Unlock better versions of the available players 
     In  order  to  unlock  the  star versions of each player you must
defeat  them  in a vs. character match when they have an envelope next
to  their character select symbol on the vs. screen. The star versions
of  the  players  can drive the ball a lot farther then their original
counterparts

Unlock Birdie Challenge Back Nine 
     Just  beat  the  front nine in the birdie challenge to unlock the
back nine.

Unlock Boo 
     Get 50 Best Badges to unlock Boo.

Unlock Character "Bowser Jr." 
     Complete the ring shot mode entirely with any character to unlock
Bowser Jr.

Unlock Character "Shadow Mario" 
     Collect  Every  Badge  in  Tournament mode to unlock Shado Mario.
(You  get  badges  by getting a Birdie or better on each hole, but you
can  only  get  one per hole, meaning, you can't keep playing the same
hole over again and getting a badge)

Unlock Course "Blooper Bay" 
     Place 1st in the Sands Classic with any character.

Unlock Course "Bowser Championship"  
     Place 1st in the ''Peach's Invitational'' with any character.
 
Unlock Course "Peach's Castle Grounds" 
     Place 1st in the Blooper Open with any character.

Unlock Expert-Level Side Games 
     Simply  clear an intermediate level side game, in order to unlock
its harder counterpart.

Unlock Hollywood Video Tour 
     Hold  Z at start screen, press start. Go to the new special event
option, select password tournament, then enter BJGQBULZ

Unlock Intermediate-level Side games 
     Simply  clear  the  beginner  level  of a side game to unlock its
intermediate level counterpart.

Unlock Petey Piranha 
     To  unlock  Petey Piranha you must beat the Shooting, Approching,
and Putting side games on all 3 levels.