Cheat mode
Go to the options menu and choose "Cheats". Answer the series of 
seven questions with the following to unlock the entire game:
 
1. Squid
2. Conroy
3. Tito Makani
4. Maurice
5. Ocean Shores
6. Otto
7. Eddie:Prince of the Netherworld 
 
 
Play as Pi
Collect 20 Gold Coins to unlock Pi.
 
 
Play as Spurtz
Collect 30 Gold Coins to unlock Spurtz, Pi's friend.
 
 
Play as Lars
Collect 40 Gold Coins to unlock Lars.
 
 
Play as Eric Golem Jr.
Collect 50 Gold Coins to unlock Eric Golem Jr.
 
 
Play as Eddie
Collect 60 Gold Coins to unlock Eddie.
 
 
Bonuses
Get 750 on the Shooting Gallery and The Brains That Ate California 
for two Gold Coins and two episodes of Rocket Power.