Bonus characters:
Completion of each of the following will unlock a Bonus Character 

     Street Work Mode: Get an "A" rank on each level and track 
     Street Work Mode: Get an "S" rank on each level and track 
     Time Attack Mode: Complete each level and track in within the time limit. 
     Coin Mode: Earn a "Perfect" rank on each level and track 


Bonus boards:
After all four new characters have been unlocked, press Up, Up, Down, Down ,Left, Right, Left,
Right, B, A at the board selection screen. These four bonus boards will now be available:

     Ika-Chu (Double jumps) 
     Father (Longer air time) 
     J-B (Press A + B for turbo jump) 
     J-Arm: (Extra turbos)