Funkytown 
     Play every game at least one time in Single Player mode to unlock
Funkytown.

Mini-games 
     Mini-games   are   unlocked  by  playing  Trips.  To  unlock  all
mini-games,  play  each Trip two times. Note: A Nunchuck controller is
required  for  some Trips to unlock their mini-games. You also need to
unlock  the last Trip and play it twice. To unlock the last Trip, play
all other Trips once.

Shooting mini-games 
     Play  all Trips to unlock all shooting mini-games. Each Trip will
unlock a shooting game.

Bonus song 
     Play  all  mini-games  and  FPS games to unlock a new song in the
Tropics Trip.

Jukebox songs 
     Play a song game to unlock its song in the Jukebox.

Alternate starting menu 
     Successfully complete 100\% of the game to have a crown appear at
the "Press Start" menu.

Bonus costumes 
     Successfully   complete   the   indicated   task  to  unlock  the
corresponding costume:

Unlockable:         How to unlock:

Crash Test Dummy    Get over 12,000 points in Shopping Cart, Downhill. 

French Maid         Get over 12,000 points in Little Chemist. 

Fruit-Hat Dancer    Shoot the Right Rabbid in the Year Of The Rabbids 
                    to get the high score. 
                    
HAZE Armor          Shoot the Right Rabbid in Big City Fights 
                    to get the high score. 
                    
Indiana Jones       Get over 12,000 points in Rolling Stone. 

Ken                 Get over 12,000 points in RRR Xtreme Beach 
                    Volleyball. 
                    
Leonardo (TMNT)     Get over 12,000 points in Usual Rabbids. 

Raider's Rabbid     Get over 12,000 Points in American Football. 

Red Space Rabbid    Get over 12,000 points in Year Of The Rabbids. 

Transformer         Get over 12,000 points in the plumbing mini-game.