Input those codes on the password screen, availiable on the main menu.

Password	Effect
RK3SJS9Q7J	All stages and mini-games unlocked
RK3V?S9Q7W	All Tank Gang Members Escape. You will be able to play Score/Time Attacks on all the games at the world map and the Three Challenges in Gill's Escape, as well as be able to play those three challenges in Multi-Player Mode.
h7c2?s9Q75	Bloat escape completed
16CX?S9Q72	Bubbles escape completed