Hidden costume

First, choose your character. Then select edit name. Put in the secret 
password as your name and you will get the hidden costume: 

Liltiger          Tiger's 70s Costume
Prodigy           Tiger's 80s Costume
Costume	Brat      Little Mark's 70s
Costume	Marko     Little Mark's 80s
Cybertw           Billy in a Black Sweater
Willi             Billy in a White Shirt
Retro             Inga in Flower Costume
Ice               Chip With a Goatee
Safari            Traci in Leopard Costume

Secret characters

First, choose your character. Then select edit name. Put in the secret 
password as your name and you will get the secret character: 

Ufo               Martian
Rapper            Kimmi
Retro             Starr
Miner Golddgr     Ghost
Delvis            Biker
Tigerrrr          Tiger
Instyle           Cindy
Martian           Ufo     
Rapper            Kimmi	
Retro             Starr	

Select a course

First, choose your character. Then select edit name. Put in the secret 
password as your name and you will get the following course: 

Sthelens     Volcano Course	

Tiger's new costume

To get Tiger's new costume go over him and press A then go to Edit 
name and type Prodigy. Now you get his new costume.