Character Cheats
These cheats will allow you to either unlock secret characters or alter the appearance of your characters in specific ways:
Happyheads -- unlocks all characters except Iggy's Girlfriend Lizzie;
Entaroadun -- unlocks Iggy's girlfriend Lizzie;
Swopshop -- adds accessories to characters;
Toomuchpie -- fatter Reckin' Balls;
Microballs -- smaller Reckin' Balls.
Gameplay Cheats
These cheats will alter the course of gameplay in some way, such as changing the game's physics behavior or how fast a character is able to climb the course:
2times -- rollerball twice as long as normal;
Gobaby -- full turbos;
Iceprincecess -- ice platforms;
Gooeygoogoo -- goo platforms;
Gooeyiceprincess -- both goo and ice platforms;
Toomuchfun -- adds bouncy physics to your balls.
Visual Cheats
These cheats don't have any effect on actual gameplay besides altering the visual appearance of the game world:
Pencil -- pencil sketch view;
2roktoo -- enables the Turok 2 effects engine;
Ohmy -- switches on fireworks particle effects.
Level Selection Cheats
The last two cheats for Iggy's Reckin' Balls open up all levels for play:
Theuniverse -- opens up all tracks;
Jumparound -- activates a level-select feature, accessible from the pause menu.