Enter each of the following codes on the Cheat 
screen. To access this screen, press the R Button
and Z Button simultaneously at the Main Menu. 
Once you've input the code press the Start button
to activate it. If you did it correctly, you will
hear a "boiing" sound. During game play, if you 
pause, you will see a new option called Cheat Menu,
accessing this menu can enable or disable any code
you have entered.

Code - Function 

     THEUNIVERSE - All tracks available 
     HAPPYHEADS - All hidden characters but one 
     JUMPAROUND - Level select [Note] 
     ICEPRINCESS - Ice platforms 
     GOOEYGOOGOO - Gooey platforms 
     GOOEYICEPRINCESS - Icy and gooey platforms 
     SWOPSHOP - Mix and match mode 
     2TIMES - Turbo mode 
     GOBABY - Full turbos 
     ROLFHARRIS - Black and white mode 
     PENCIL - Pencil and ink mode 
     OHMY - Random bombs 
     TOOMUCHFUN - Bouncy physics on your balls 
     MICROBALLS - Tiny reckin' balls 
     TOOMUCHPIE - Fat reckin' balls 
     NONSTOP - Non-stop roller ball 
     2ROKTOO - Enable Turok 2 graphic effect engine 

Pause the game to access the level selection option.